How we researched this guide
We compared six automotive degreasers across three families — citrus concentrates, alkaline concentrates and a ready-to-use aerosol — checking each against maker documents: Meguiar’s via its D108 bulletin and safety data, Chemical Guys via its maker how-to, SuperClean via its listing and family safety data, Oil Eater and Simple Green via their spec and safety records, and Purple Power via its directions, FAQ record and safety data sheet. Dilutions print only where a maker documents them.
For surface rules we followed each maker’s own cautions, and we reviewed owner reports on detailing forums and retailer pages, linked in each review. We do not test degreasers and we print no prices. This pillar sits in our automotive degreasers archive inside the wider cleaning chemicals and consumables archive.
The 30-second answer
Choose by surface first, soil second. Most car owners should buy Chemical Guys Signature Series Orange Degreaser and work its documented ladder — 20:1 general, 10:1 for oily bays. Detailers get exact mixes from Meguiar’s Super Degreaser. SuperClean Aerosol is the no-mix option, Oil Eater Original covers mixed materials, Simple Green Industrial is the gentlest concentrate, and Purple Power is for steel parts only. Sibling guidance lives in our heavy equipment degreaser guide and the engine cleaners archive.
Best Overall
Chemical Guys Signature Series Orange Degreaser, 1 Gallon
Best if one bottle must handle a whole car: a citrus concentrate with a documented ladder from 20:1 for general work to 10:1 for oily engine bays.
Best for Detailers
Meguiar’s Super Degreaser, 5 Gallon, D10805
Best if you degrease cars every week: the maker bulletin gives two exact mixes, 4:1 heavy and 10:1 medium, a 30 to 45 second dwell and a residue-free rinse.
Best Ready-to-Use
SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz
Best if mixing is the friction: a ready-to-use aerosol documented for engine work that dissolves grease on contact — no dilution chart, just spray and rinse.
Best for Mixed Surfaces
Oil Eater Original Cleaner Degreaser, 1 Gallon
Best if the job crosses materials: the maker record lists aluminium, painted surfaces, plastics and rubber among its surfaces, with mixes from general cleaning to a parts sink.
Gentlest Concentrate
Simple Green Industrial Cleaner and Degreaser, 1 Gallon
Best if harsh chemistry is the concern: a nontoxic, nonabrasive, noncorrosive concentrate positioned for engines and vehicles, usable by hand or in cleaning equipment.
Strongest for Steel Parts
Purple Power Industrial Strength Degreaser, 1 Gallon
Best if the parts are steel and the grease is baked on: a concentrated alkaline with a maker-documented 1:1 parts-washer mix. Its maker bans it on aluminium, chrome, paint and glass.
Quick compare: the six car degreasers at a glance
| Product | Form | Size | Documented working dilutions | Check Price |
|---|---|---|---|---|
| Chemical Guys Orange | Citrus concentrate | 1 gal | 20:1 general; 10:1 oily bays | Check Price |
| Meguiar’s Super Degreaser | Alkaline concentrate | 5 gal | 4:1 heavy; 10:1 medium | Check Price |
| SuperClean Aerosol | Ready-to-use aerosol | 17 oz | None — use as supplied | Check Price |
| Oil Eater Original | Alkaline concentrate | 1 gal | 10:1 general; 3–4:1 parts sink | Check Price |
| Simple Green Industrial | Concentrate | 1 gal | 1 measure to 10 measures water (manual) | Check Price |
| Purple Power 4320P | Alkaline concentrate | 1 gal | 1:1 parts washer (maker FAQ) | Check Price |
Ratios are water to product unless stated otherwise. Stronger is not better on a car: it is how bare aluminium gets hazed.
Degreaser finder: match the product and dilution to the car job
Pick the job and how heavy the soil is. Every result names a degreaser from this guide, the maker-documented dilution for that job, and its button. Ratios are water to product.
How to choose an automotive degreaser for cars
Surface first: paint, aluminium, chrome and glass
A car is a patchwork of finishes, and the strongest bottle is often the wrong bottle. Purple Power’s safety data lists polished aluminium, chrome, painted surfaces and glass as do-not-use surfaces. Name every material in the spray path first, and pick the chemistry documented as safe for the most delicate one.
Soil second: road film, engine grease, or baked-on oil
Light road film needs the weak end of a documented ladder, not the strong end. Chemical Guys documents 20:1 for general messes and reserves 10:1 for oily engine work. Baked-on oil around a leaking valve cover is a different job — there a short, strong, documented dwell beats a long soak in a weak mix.
Dilution discipline and labelled bottles
A concentrate is several cleaners in one jug, and the maker’s ratio is the product. Meguiar’s publishes exactly two mixes for D108; Oil Eater publishes a different mix for a parts sink than for general cleaning. Mix in a labelled, chemical-resistant sprayer and write the ratio on the bottle.
Dwell time: short, wet, and never dried on
Every maker here gives the same warning: do not let the degreaser dry on the surface. Meguiar’s dwell is 30 to 45 seconds; Chemical Guys allows up to five minutes while the surface stays wet. Work one panel at a time, keep it wet, brush, and rinse inside the window.
Application: aerosol, spray bottle, or pressure washer
Match the format to the job size. An aerosol suits one greasy bracket with zero mixing. A diluted concentrate covers a full bay or a set of wheels. A pressure washer suits driveways and underbodies — only with a product whose record documents machine use, and only with runoff contained. Our pressure washers archive covers the machines.
Safety data and runoff, read before the marketing
Read the hazard line first. The D108 safety data classifies it for severe skin burns and eye damage, which settles the gloves-and-glasses question for every strong alkaline here. Then plan the rinse: that oily water belongs on absorbent pads, not in a storm drain.
Degreaser dilutions by car job
| Car job | Product | Maker-documented dilution | Source |
|---|---|---|---|
| General bay and wheel work | Chemical Guys Orange | 20 parts water to 1 part product | Maker how-to via listings |
| Oily engine-bay messes | Chemical Guys Orange | 10 parts water to 1 part product | Maker how-to via listings |
| Heavy-duty degreasing | Meguiar’s Super Degreaser | 4 parts water to 1 part product | Maker D108 bulletin |
| Medium-duty degreasing | Meguiar’s Super Degreaser | 10 parts water to 1 part product | Maker D108 bulletin |
| General cleaning | Oil Eater Original | 10 parts water to 1 part product | Maker guidance via trade record |
| Sink-style parts washing | Oil Eater Original | 3–4 parts water to 1 part product | Maker guidance via trade record |
| Manual parts cleaning | Simple Green Industrial | 1 measure product to 10 measures water | Maker label manual |
| Parts washer, steel parts | Purple Power 4320P | 1 part product to 1 part water | Maker FAQ record |
| Driveway via pressure washer | Purple Power 4320P | About 10:1 in the detergent tank | Retailer FAQ record |
| Spot engine grease | SuperClean Aerosol | Ready to use; no dilution | Amazon listing for the aerosol |
Keep this table with the chemicals. A labelled bottle prevents the two classic mistakes — too weak to work, or strong enough to mark a finish. The same routine appears in our winch maintenance checklist and the engine cleaning tools archive.
Automotive degreasers by budget
| Tier | What you get | Example pick from this guide |
|---|---|---|
| Ready-to-use tier | No mixing, no chart, spray and rinse | SuperClean Aerosol |
| Single-gallon concentrate tier | One jug covering bays, wheels and floors | Chemical Guys Orange / Oil Eater Original |
| Gentler concentrate tier | Lower-hazard chemistry for frequent light work | Simple Green Industrial |
| Bulk detailer tier | Weeks of labelled bottles from one container | Meguiar’s Super Degreaser, 5 Gallon |
| Steel-parts strength tier | Maximum alkaline strength for a parts washer | Purple Power 4320P |
Every tier demands the same gloves, eye protection and runoff care. Paying more buys yield and range, not permission to skip the safety box. See also our shop towels archive for the consumables that go with this work.
Types of automotive degreasers compared
| Type | Pros | Cons | Best for |
|---|---|---|---|
| Citrus concentrate | Pleasant to work around; documented strength ladder | Full strength kept off delicate finishes | Whole-car work (Chemical Guys Orange) |
| Alkaline concentrate | Strongest on mineral oil and baked grease | Real surface bans; PPE mandatory; never dried on | Detailers and steel parts (Meguiar’s, Purple Power, Oil Eater) |
| Ready-to-use aerosol | Zero mixing error; instant spot work | No yield advantage on whole-bay washes | Spot grease (SuperClean Aerosol) |
| Lower-hazard concentrate | Nontoxic, nonabrasive positioning; equipment-friendly | May need a second pass on baked-on oil | Frequent light cleaning (Simple Green Industrial) |
Most garages end up with two of these: a concentrate for planned washes and one ready-to-use can for surprises. That pairing, plus the brake cleaners archive for brake work, covers nearly every greasy job a car presents.
Detailed reviews of the best automotive degreasers for cars
Each review follows the same order — why it earns its award, documented specs, fit, pros and watch-outs, owner reports, who should skip it, and pairings. Surface bans are printed inside each review.
Best Overall: Chemical Guys Signature Series Orange Degreaser, 1 Gallon
Best Overall
Why the Chemical Guys Signature Series Orange Degreaser, 1 Gallon is our pick
This citrus concentrate earns the top slot because its maker publishes a complete strength ladder for car work instead of a single vague ratio. Start every job at the gentle end, step up only where grease survives, and reserve full strength for the undercarriage filth the maker names — axle grease, differential oil and transmission fluid.
Chemical Guys Signature Series Orange Degreaser, 1 Gallon key specs
- Maker: Chemical Guys
- Part number: CLD_201 (gallon concentrate)
- Form: citrus-based liquid concentrate
- Size: 1 gallon (128 fl oz)
- General dilution: 20 parts water to 1 part product
- Oily engine-bay dilution: 10 parts water to 1 part product
- Strongest use: full strength for intense filth, per maker how-to
- Dwell: up to 5 minutes; do not let it dry on the surface
- Surfaces in maker material: engines, wheels, undercarriages, tools, floors
- Working condition: cool surface only
- Rinse: steady stream of free-flowing water
Chemical Guys Signature Series Orange Degreaser, 1 Gallon: fits and best for
Cars whose owners clean the whole vehicle with one chemistry shelf: routine engine bays, greasy wheel wells, undercarriage film before an inspection, and the tools and floor that collect the runoff.
Chemical Guys Signature Series Orange Degreaser, 1 Gallon pros and watch-outs
Pros
- Documented ladder from gentle to full strength
- Citrus base is pleasanter to work around than solvent aerosols
- One gallon covers bays, wheels, tools and floors
- Maker how-to is specific about dwell and rinsing
Watch-outs
- Must be diluted for almost every job — a sprayer is required
- Full strength can mark delicate finishes if misused
- Residue if rinsed carelessly, per roundup coverage
Chemical Guys Signature Series Orange Degreaser, 1 Gallon: what owners report
AutoGuide’s engine-degreaser roundup names this product its Editor’s Pick and credits it with loosening wheel and undercarriage grime and road tar as well as bay grease — see the AutoGuide degreaser roundup.
The Drive lists it as its Best Value pick, praising the ability to mix stronger while flagging that it must be diluted — see The Drive engine degreaser guide.
Chemical Guys Signature Series Orange Degreaser, 1 Gallon: who should not buy
Skip it if you will not measure dilutions: a concentrate used by feel is either too weak or too strong. The ready-to-use SuperClean Aerosol in this guide removes the mixing step entirely.
Chemical Guys Signature Series Orange Degreaser, 1 Gallon: pair it with
Pair it with a labelled chemical-resistant sprayer: the Zep Professional Sprayer, 32 oz, 3-pack is our research-verified sprayer, and a soft wheel brush handles the agitation step.
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Tip: start at 20:1 on a new car and step up only where grease survives the first rinse — the maker’s own sequence. More notes sit in our engine cleaners archive.
Best for Detailers: Meguiar’s Super Degreaser, 5 Gallon, D10805
Best for Detailers
Why the Meguiar’s Super Degreaser, 5 Gallon, D10805 is our pick
Detailers live on repeatability, and Meguiar’s publishes the tightest working numbers in this guide: two dilutions, a pH figure, and a dwell measured in seconds. The 5-gallon D10805 is the bulk form of that D108 line, sized for a bench that fills labelled bottles every week.
Meguiar’s Super Degreaser, 5 Gallon, D10805 key specs
- Maker: Meguiar’s
- Part number: D10805 (5 gallon); D108 line also in 1 gallon D10801
- Form: alkaline liquid concentrate
- Size: 5 gallons (640 fl oz)
- pH: 13.5, per maker technical bulletin
- Heavy-duty dilution: 4 parts water to 1 part product
- Medium-duty dilution: 10 parts water to 1 part product
- Dwell: 30–45 seconds, then rinse thoroughly
- Fragrance: herbal, per maker bulletin
- Residue: maker positions it as residue-free when rinsed as directed
- Use status: bulletin marked for commercial use
- Associated bottle: Meguiar’s D20108 32 oz dilution bottle
Meguiar’s Super Degreaser, 5 Gallon, D10805: fits and best for
High-frequency users: mobile detailers, small shops, and home garages maintaining several cars. Documented work includes engine degreasing, tire cleaning on cool wheels, door jambs and wheel wells.
Meguiar’s Super Degreaser, 5 Gallon, D10805 pros and watch-outs
Pros
- Exact maker mixes for heavy and medium work
- Very short documented dwell speeds up routine jobs
- Residue-free positioning suits tires and jambs
- Bulk size matches bottle-filling workflows
Watch-outs
- High pH — gloves and eye protection are mandatory
- Dries quickly; work small areas, per owner reports
- Strong odour reported by some owners
- Commercial-use positioning on the maker bulletin
Meguiar’s Super Degreaser, 5 Gallon, D10805: what owners report
Detailed Image’s review page for D108 carries detailer reports of strong results on tires, door jambs, engines and wheel wells at both documented dilutions — read the Detailed Image D108 owner reviews.
An Autopia owner thread describes spraying it on a cold engine and rinsing with a wide fan tip to a spotless bay — see the Autopia Meguiar’s owner thread. The same record warns it dries quickly and smells strong, which is why this review keeps areas small.
Meguiar’s Super Degreaser, 5 Gallon, D10805: who should not buy
Skip it if you degrease one car twice a year: a 5-gallon alkaline concentrate is bench stock, not shelf stock. The gallon of Chemical Guys Orange Degreaser fits that rhythm better.
Meguiar’s Super Degreaser, 5 Gallon, D10805: pair it with
Pair it with labelled dilution bottles: the research-verified Zep Professional Sprayer, 32 oz, 3-pack for working solutions, and keep a microfiber towel rotation for the wipe-down after rinsing.
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Tip: wet the panels next to the bay before spraying, as the maker bulletin advises, so overspray cannot stain dry paint. Related upkeep lives in our engine maintenance archive.
Best Ready-to-Use: SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz
Best Ready-to-Use
Why the SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz is our pick
Sometimes the job is one greasy alternator bracket five minutes before the car has to move. This aerosol is our pick for that moment: its listing documents it as a biodegradable, ready-to-use engine degreaser, and the Tough Task record is built around dissolving grease on contact with no dilution step.
SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz key specs
- Maker: SuperClean
- Form: ready-to-use aerosol
- Size: 17 oz
- Specific use on listing: engine
- Material feature on listing: biodegradable
- Scent on listing: unscented
- Dilution: none — use as supplied
- Family SDS record: pH about 13.0 neat (Tough Task line)
- Family SDS caution: avoid contact with glass
- Detailing guidance: full strength can etch bare, uncoated aluminium
- Application: spray on, allow to work, rinse or wipe, per family directions
SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz: fits and best for
Spot work on cars: a weeping fitting, a greasy hinge, a pulley or bracket before a belt change, and the single stained corner of a bay that does not justify mixing a bottle.
SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz pros and watch-outs
Pros
- No mixing, no chart, no labelled bottle to maintain
- Biodegradable positioning on the listing
- Unscented form suits enclosed garages
- Dissolves grease on contact, per family record
Watch-outs
- Aerosol size is spent quickly on whole-bay washes
- Keep it off glass, per the family safety data
- Full strength can etch bare aluminium finishes
- Still a strong alkaline — gloves and ventilation apply
SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz: what owners report
Advance Auto Parts’ reviews for the Tough Task line praise its soaking power on engine gunk and concrete, with the recurring owner advice to wear gloves, ventilate, and never let it dry — see the Advance Auto Parts SuperClean reviews.
An independent long-form review of the line values the choice between full strength for heavy jobs and diluted mixes for lighter ones — read the Super Clean degreaser review.
SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz: who should not buy
Skip it if your regular job is a whole engine bay or a fleet: aerosols are convenience-priced by the ounce in use, and a concentrate such as Oil Eater Original covers large areas more sensibly.
SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz: pair it with
Pair it with absorbent pads under the work: the PIG Oil-Only Absorbent Mat Pads from our research, plus a wipe from the shop towels archive.
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Tip: spray the greasy part, not the whole bay — targeted application keeps a strong alkaline off glass and bare aluminium. For planned washes, start from our automotive degreasers archive instead.
Best for Mixed Surfaces: Oil Eater Original Cleaner Degreaser, 1 Gallon
Best for Mixed Surfaces
Why the Oil Eater Original Cleaner Degreaser, 1 Gallon is our pick
A classic car bay mixes painted inner fenders, aluminium castings, rubber hoses and steel brackets within one spray pattern. Oil Eater earns this slot because its maker record names that exact mix — aluminium, painted and powder-coated surfaces, plastic, rubber, steel and stainless — with a documented mix for each delivery method.
Oil Eater Original Cleaner Degreaser, 1 Gallon key specs
- Maker: Kafko International
- Part number: AOD1G35437
- Form: water-based alkaline concentrate
- Size: 1 gallon (128 fl oz)
- pH: 12.4, per maker MSDS record
- General dilution: 10 parts water to 1 part product
- Parts-sink dilution: 3–4 parts water to 1 part product
- Ultrasonic dilution: 20–25 parts water to 1 part product
- Listed materials: aluminium, painted and powder-coated surfaces, plastic, rubber, steel, stainless steel
- Minimum working temperature: 55 F, per Grainger record
- Maker position: biodegradable, non-corrosive, non-flammable; no acids or petroleum solvents
Oil Eater Original Cleaner Degreaser, 1 Gallon: fits and best for
Mixed-material engine bays, driver-quality classic cars, and garages where one concentrate must also handle the floor and the parts sink.
Oil Eater Original Cleaner Degreaser, 1 Gallon pros and watch-outs
Pros
- Widest documented surface list in this guide
- A documented mix for nearly every delivery method
- Water-based and non-flammable positioning
- Works in parts washers and pressure washers
Watch-outs
- Spot-test first, per maker guidance
- Very heavy deposits may need a second soak
- Weaker mixes disappoint on baked-on oil
- Slippery residue if mixed too strong, per maker note
Oil Eater Original Cleaner Degreaser, 1 Gallon: what owners report
Roundup coverage repeats the same pattern: strong results in engine compartments and on driveway oil, with honest notes that the heaviest deposits can need a repeat soak rather than a stronger mix.
Trade coverage describes long-running fleet and shop use, with the wash line positioned as safe on polished aluminium, rubber, vinyl and paint when used as directed. Owner coverage is roundup-level rather than forum-deep, and this review says so plainly.
Oil Eater Original Cleaner Degreaser, 1 Gallon: who should not buy
Skip it if your only job is baked-on steel parts in a washer: Purple Power at its maker 1:1 parts-washer mix is the stronger tool for that single task.
Oil Eater Original Cleaner Degreaser, 1 Gallon: pair it with
Pair it with the gloves this work always needs: the TitanFlex 8-mil nitrile gloves from our research, and keep the oil drain pan guide in mind for the fluid work that usually follows a degrease.
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Tip: if a rinsed floor still feels slippery, the maker’s diagnostic is that the mix was too strong — add water next time. More categories sit in the cleaning chemicals archive.
Gentlest Concentrate: Simple Green Industrial Cleaner and Degreaser, 1 Gallon
Gentlest Concentrate
Why the Simple Green Industrial Cleaner and Degreaser, 1 Gallon is our pick
Not every greasy car job needs a corrosive-class concentrate. Simple Green Industrial earns its place on positioning its spec sheet states plainly: nontoxic, nonabrasive and noncorrosive, safe for all washable surfaces, and documented for engines, machinery and vehicles.
Simple Green Industrial Cleaner and Degreaser, 1 Gallon key specs
- Maker: Sunshine Makers (Simple Green)
- Part number: 13005
- Form: liquid concentrate
- Size: 1 gallon (128 fl oz)
- Spec-sheet position: nontoxic, nonabrasive, noncorrosive
- Surfaces: all washable surfaces, per spec sheet
- Documented uses: engines, machinery, vehicles, manufactured parts
- Equipment: parts washers, dip tanks, pressure washers, foamers, floor scrubbers
- Manual mix example: 1 measure product to 10 measures water, per label manual
- SDS record: not classified as hazardous (maker AU SDS)
- Use limit: do not use on non-rinsable surfaces, per SDS
Simple Green Industrial Cleaner and Degreaser, 1 Gallon: fits and best for
Frequent light degreasing in a shared garage: routine bay wipe-downs, greasy handprints around latches, pre-wash degreasing before a normal car wash, and parts that will be handled bare-handed the same day.
Simple Green Industrial Cleaner and Degreaser, 1 Gallon pros and watch-outs
Pros
- Gentlest hazard profile in this guide
- Documented for hand use and cleaning equipment alike
- Nonabrasive positioning suits washable finishes
- One concentrate covers car, tools and garage
Watch-outs
- Baked-on oil may need repeat applications
- Generalist formula, not an engine specialist
- Still requires rinsing — not for non-rinsable surfaces
- Eye protection directed on the label manual
Simple Green Industrial Cleaner and Degreaser, 1 Gallon: what owners report
Forum coverage includes owners using Simple Green lines on dirt-bike and diesel engines with minimal scrubbing, valuing the milder handling — see the Hobby-Machinist degreaser thread.
Coverage is thinner than for the detailing brands, so this review leans on the maker spec sheet and safety data for its claims and links them in Sources rather than dressing up forum mentions as a test record.
Simple Green Industrial Cleaner and Degreaser, 1 Gallon: who should not buy
Skip it if the job is a neglected, oil-caked engine that has not been cleaned in years: start with Meguiar’s Super Degreaser at its documented heavy mix, then maintain with this gentler concentrate.
Simple Green Industrial Cleaner and Degreaser, 1 Gallon: pair it with
Pair it with a bucket wash from the car wash soaps archive after degreasing, and the Zep Professional Sprayer, 32 oz, 3-pack for a labelled 1-to-10 working bottle.
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Tip: keep a labelled bottle at the label’s 1-to-10 manual strength by the bench for weekly wipe-downs — where this product beats the strong alkalines. See also our engine flush guide for internal engine cleaning, a different job entirely.
Strongest for Steel Parts: Purple Power Industrial Strength Degreaser, 1 Gallon
Strongest for Steel Parts
Why the Purple Power Industrial Strength Degreaser, 1 Gallon is our pick
Purple Power is the strongest tool in this guide and the most restricted — both facts come from its own documents. Its FAQ record documents a 1:1 parts-washer mix for steel, while its safety data lists polished aluminium, chrome, painted surfaces and glass as do-not-use surfaces.
Purple Power Industrial Strength Degreaser, 1 Gallon key specs
- Maker: Aiken Chemical (Clean-Rite)
- Part number: 4320P
- Form: alkaline liquid concentrate
- Size: 1 gallon (128 fl oz)
- Parts-washer dilution: 1 part product to 1 part water (maker FAQ record)
- Pressure-washer record: about 10:1 starting ratio in the detergent tank, downstream injection
- Maker position: biodegradable, non-abrasive, non-flammable, phosphate-free
- Do-not-use surfaces (SDS): polished aluminium, chrome, painted surfaces, glass
- Maker FAQ caution: not for stainless steel or aluminium; not recommended for washing cars
- Hazard record (SDS): serious eye damage category 1; skin irritation category 2
- PPE (SDS): protective gloves and eye protection
Purple Power Industrial Strength Degreaser, 1 Gallon: fits and best for
Steel-only work: subframes, steel brackets, engine blocks on a stand, greasy tools, parts-washer loads, and concrete oil stains. Nothing with a finish you care about belongs in its spray path.
Purple Power Industrial Strength Degreaser, 1 Gallon pros and watch-outs
Pros
- Strongest documented parts-washer mix in this guide
- Concentrate dilutes across a wide range
- Non-flammable, phosphate-free positioning
- Equally documented on concrete and steel
Watch-outs
- Banned by its maker on aluminium, chrome, paint and glass
- Not recommended by its maker for washing cars
- Serious eye-damage hazard class demands real PPE
- White streaks or haze if misused on metals, per maker FAQ
Purple Power Industrial Strength Degreaser, 1 Gallon: what owners report
AutoGeek’s tire-cleaner thread carries owners buying it by the gallon and diluting it, alongside the standing warning to be careful around anodized aluminium and to rinse before it dries — read the AutoGeek tire cleaner thread.
A comparison record this session likewise routes bare aluminium work to gentler products and keeps Purple Power for heavy engine and undercarriage grease at dilution, which matches the maker position printed above.
Purple Power Industrial Strength Degreaser, 1 Gallon: who should not buy
Do not buy it as your only car degreaser: its maker bans it on most of a car’s finished surfaces. As a sole bottle, Chemical Guys Orange Degreaser is the safer household choice.
Purple Power Industrial Strength Degreaser, 1 Gallon: pair it with
Pair it with containment for driveway work: the PIG Oil-Only Absorbent Mat Pads under the spray area, and the oil absorbent mats archive for refills.
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Tip: keep a dedicated, labelled parts-washer mix at 1:1 and never decant it into an unmarked sprayer — most damage stories start with the wrong bottle. Chemical neighbours live in the penetrating oils archive.
Spec comparison: all six degreasers side by side
| Spec | Chemical Guys Orange | Meguiar’s Super | SuperClean Aerosol |
|---|---|---|---|
| Form | Citrus concentrate | Alkaline concentrate | Ready-to-use aerosol |
| Size | 1 gal | 5 gal | 17 oz |
| Part number | CLD_201 | D10805 | Not published |
| Documented dilutions | 20:1 / 10:1 / full strength | 4:1 heavy / 10:1 medium | None |
| Dwell | Up to 5 minutes | 30–45 seconds | Per label directions |
| pH | Not published | 13.5 | About 13.0 (family SDS) |
| Check Price | Check Price | Check Price | Check Price |
| Spec | Oil Eater Original | Simple Green Industrial | Purple Power 4320P |
|---|---|---|---|
| Form | Alkaline concentrate | Concentrate | Alkaline concentrate |
| Size | 1 gal | 1 gal | 1 gal |
| Part number | AOD1G35437 | 13005 | 4320P |
| Documented dilutions | 10:1 / 3–4:1 / 20–25:1 | 1 measure to 10 water | 1:1 parts washer |
| Dwell | Per maker guidance | Do not allow to dry | Do not let dry |
| Key surface note | Aluminium and paint listed | All washable surfaces | No aluminium, chrome, paint, glass |
| Check Price | Check Price | Check Price | Check Price |
Two tables keep every column readable on a phone. Read the surface-note row before the dilution row.
How to degrease a car engine bay safely
Start with a cold engine — every maker here works on cool surfaces, and a hot bay flashes degreaser dry before it can work. Cover the intake, alternator, battery and exposed electrics, pre-rinse loose grit, then apply your product at its documented dilution. Work one side at a time, brush baked areas, and rinse from the top down. Remove the covers, run the engine briefly, and inspect for the leak the grease was hiding. Supporting reading: our rust removers archive, the gas engine flush guide for internal cleaning, and the car cleaning and detailing archive for the wash that finishes the job.
Safety essentials for degreasing cars
Wear gloves and eye protection with every alkaline here. The D108 safety data classifies it for severe skin burns and eye damage; Purple Power carries a serious eye-damage class too.
Degrease only a cold engine. Maker directions across this guide require cool surfaces and covered intakes and electrics before any product or water is applied.
Never let degreaser dry on a surface. Every maker here prints a version of this rule; dried alkaline hazes aluminium and marks finishes.
Respect each maker’s ban list. Purple Power is banned on aluminium, chrome, paint and glass; SuperClean’s family data says avoid glass; full-strength products stay off bare aluminium.
Contain the runoff. Lay absorbent pads first, keep rinse water out of storm drains, and dispose of oily waste under local rules.
Never mix degreasers, and ventilate the garage. One product, one labelled bottle, one job.
Three safety picks with verified listings from our research:
Safety pick
TitanFlex Heavy Duty Orange Nitrile Gloves, 8-mil
Thick nitrile gloves for alkaline work; confirm your size on the listing before ordering.
Mixing pick
Zep Professional Sprayer Bottle, 32 oz, 3-pack
Chemical-resistant sprayers for diluted concentrates — label every bottle with its ratio.
Runoff pick
PIG Oil-Only Absorbent Mat Pads, MAT454
Oil-only pads laid under the work before spraying, so dissolved grease is captured, not drained.
More consumables sit in our oil absorbent mats archive and the odor remover reviews handle the smells a freshly degreased bay can reveal.
Troubleshooting degreasing problems
| Symptom | Likely cause | Fix |
|---|---|---|
| Grease survives the first pass | Mix too weak or dwell too short | Step up one documented dilution band; agitate with a brush |
| White haze on aluminium | Strong alkaline used on bare aluminium, or allowed to dry | Stop; rinse; switch to Oil Eater or citrus at a weak mix and spot-test |
| Wax or sealant looks stripped | Degreaser used on painted panels at strength | Rewash gently, reapply protection; keep strong mixes off paint |
| Bay smells of chemicals afterwards | Residue left in seams and trays | Rinse again with free-flowing water and dry with engine heat |
| Floor still slippery after rinsing | Mix was too strong, per Oil Eater guidance | Rinse again; add more water to the next mix |
| New oil film returns within days | An active leak, not a cleaning failure | Degrease, dry, then trace the leak on the clean engine |
Who should NOT buy these degreasers
Owners of polished aluminium, chrome or show paint as their only targets. The strongest products here are banned by their makers on those finishes. Start with the gentler end of this guide and the car cleaning and detailing archive instead.
Anyone who will not measure a dilution. Concentrates used by feel damage finishes and waste money. Buy the ready-to-use aerosol in this guide, or a ready-to-use product from the engine cleaners archive.
Anyone planning to rinse oil into a storm drain. No degreaser makes oily runoff drain-safe. If you cannot contain the rinse, use a commercial wash facility with an oil separator.
Buyers chasing an internal engine clean. These products clean the outside of an engine. Oil-system cleaning is a different product class — see our engine flush products guide.
Final verdict
Best Overall — Chemical Guys Signature Series Orange Degreaser, 1 Gallon: Check its price
Best for Detailers — Meguiar’s Super Degreaser, 5 Gallon, D10805: Check its price
Best Ready-to-Use — SuperClean Tough Task Cleaner-Degreaser Aerosol, 17 oz: Check its price
Best for Mixed Surfaces — Oil Eater Original Cleaner Degreaser, 1 Gallon: Check its price
Gentlest Concentrate — Simple Green Industrial Cleaner and Degreaser, 1 Gallon: Check its price
Strongest for Steel Parts — Purple Power Industrial Strength Degreaser, 1 Gallon: Check its price
FAQ
What is the best degreaser for a car engine bay?
For most owners, a citrus concentrate at its documented ratios — Chemical Guys Orange at 20:1 for routine bays and 10:1 for oily messes. Work on a cold engine, cover the intake and electrics, keep the surface wet for the dwell, brush lightly and rinse with low-pressure water.
Can I use Purple Power on my whole car?
No — that is the maker’s position, not just ours. Its safety data lists polished aluminium, chrome, painted surfaces and glass as do-not-use surfaces, and its FAQ record says it is not recommended for washing cars. Reserve it for steel parts, parts washers and concrete.
What dilution should I use for Meguiar’s Super Degreaser?
The maker bulletin documents two mixes: 4 parts water to 1 part product for heavy-duty degreasing and 10 parts water to 1 part product for medium-duty work. Apply to a cool surface, let it sit 30 to 45 seconds, agitate severe grease with a brush, and rinse thoroughly before it dries.
Is degreaser safe on aluminium wheels?
Only some, and only as directed. Strong alkalines can haze bare aluminium, and Purple Power’s maker bans it there outright. Oil Eater’s record lists aluminium among its surfaces. Spot-test a hidden area, work on cool wheels, keep the dwell short and rinse before anything dries.
How long should degreaser sit on an engine?
Follow the product in your hand: Meguiar’s documents 30 to 45 seconds, Chemical Guys allows up to five minutes while the surface stays wet. Longer is not stronger — a dried degreaser is the failure mode every maker warns against. Work in small sections.
Can I pressure wash a degreased engine bay?
Use low pressure and a wide fan, only after covering intakes and electrics. Makers document pressure-washer use for several concentrates here, but a bay is not a driveway: keep distance and never drive water into connectors or the intake. A hose rinse is the safer default.
What is the difference between a degreaser and an all-purpose cleaner?
A degreaser is documented for oil and grease soils at specific dilutions; an all-purpose cleaner spreads thinner across many light soils. Simple Green Industrial sits near the border, while the purple alkalines here are degreasers first, with surface bans to match.
How do I dispose of degreaser rinse water?
Contain it. Lay oil-only absorbent pads under the work, collect what you can, keep rinse water out of storm drains, and follow local rules for oily waste. Biodegradable describes the product, not the oil it lifted off your engine.
Why did my degreaser leave white residue?
Usually one of three causes: the product dried on the surface, the mix was too strong, or the rinse was too short. Meguiar’s positions D108 as residue-free when rinsed as directed. Rinse again; if haze persists on aluminium, switch to a gentler product.
Do I need a special sprayer for diluted degreaser?
Yes, ideally: strong alkalines shorten the life of standard sprayer seals, which is why Meguiar’s sells a matched dilution bottle for D108. Whatever bottle you use, label it with the product and ratio — most degreaser accidents are unlabelled-bottle accidents.
Sources & changelog
Maker and listing sources: Meguiar’s D108 technical bulletin; Ubuy D10805 listing record (ASIN evidence); Chemical Guys Orange how-to via retail listing; SuperClean Tough Task safety data; Oil Eater Original MSDS record; Simple Green Industrial 13005 spec sheet; Simple Green Industrial safety data; Purple Power cleaner record and FAQ; Purple Power safety data sheet.
Owner and reviewer sources: Detailed Image D108 owner reviews; Autopia owner thread; AutoGuide engine degreaser roundup; The Drive engine degreaser guide; Advance Auto Parts SuperClean owner reviews; Super Clean long-form review; AutoGeek tire cleaner thread; Hobby-Machinist degreaser thread.
Changelog — October 22, 2026: guide first published.
By Leo, Founder, WinchInsider
Leo researches vehicle-care products from maker documents, safety data and owner reports — never from sponsored claims — and prints every surface ban a maker publishes.
Related guides
- Automotive degreasers archive
- Cleaning chemicals and consumables archive
- Best heavy equipment degreaser
- Engine cleaners archive
- Brake cleaners archive
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