How we researched this guide
We compared 5 contact cleaners from CRC, WD-40 Specialist, CAIG DeoxIT and MG Chemicals, checked 5 maker listings with can sizes, drying claims and plastic-safety notes, and reviewed owner discussion themes on the listings for switch cleaning, residue and plastic safety.
No product was described as tested by us. Can sizes and performance claims below are maker figures from the listings, and owner points are paraphrases of listing discussion, linked to each listing. Prices are not printed in this guide by standing rule; the title keyword refers to price comparison intent, and the picks are compared on size, formula and use.
The 30-second answer
For most electronics cleaning, the CRC QD Electronic Cleaner is the top pick for fast residue-free cleaning, the WD-40 Specialist spray suits workshop use with its Smart Straw, the DeoxIT D5S-6 is the precision choice for switches and faders, the MG Chemicals 801B suits lubricated contacts, and the DeoxIT 2-pack covers both cleaning and fader lubrication.
Best Overall
CRC QD Electronic Cleaner 05103
An 11 oz fast-drying, residue-free, plastic-safe cleaner for sensitive electronics.
Best Workshop Spray
WD-40 Specialist Contact Cleaner
An 11 oz residue-free spray with Smart Straw for precise electronics cleaning.
Best Precision Cleaner
CAIG DeoxIT D5S-6 Contact Cleaner
A 5 oz 5 percent deoxidizing spray for switches, connectors and controls.
Best Lubricated Cleaner
MG Chemicals 801B Super Contact Cleaner with PPE
A 4.5 oz plastic-safe aerosol with polyphenyl ether lubricant for contacts.
Best Two-Step Kit
DeoxIT D5S-6 and FaderLube F5S-H6 Two-Pack
A 2-pack pairing 5 oz DeoxIT cleaner with 5 oz FaderLube for faders.
| Product | Size | Drying | Best for | Check Price |
|---|---|---|---|---|
| CRC QD Electronic Cleaner 05103 | 11 oz | Fast-dry | Plastic-safe | |
| WD-40 Specialist Contact Cleaner | 11 oz | Smart Straw | Residue-free | |
| CAIG DeoxIT D5S-6 Contact Cleaner | 5 oz | 5% formula | Deoxidizer | |
| MG Chemicals 801B Super Contact Cleaner with PPE | 4.5 oz | Lubricated | Plastic-safe | |
| DeoxIT D5S-6 and FaderLube F5S-H6 Two-Pack | 5 oz each | Two-step | Audio gear |
Contact cleaner picker
Enter how many cleaning jobs you do per month, and we will point at the cleaner size that fits.
How to choose a contact cleaner
Residue-free versus lubricated
Residue-free sprays leave contacts bare and clean, which suits boards and static connectors, while lubricated cleaners leave a protective film that suits moving contacts. Choosing wrong causes problems: lubricant on a board can attract dust, while a bare fader wears quickly. Match the formula to whether the contact moves.
Deoxidizing versus washing
Plain solvents wash away dirt and grease, but oxidation on metal contacts needs a deoxidizing formula such as DeoxIT to dissolve the oxide layer. Scratchy switches and intermittent connectors usually need deoxidizing, while dusty boards usually need only washing.
Plastic safety
Some solvents attack plastics used in housings, connectors and switch bodies, so check the plastic-safe claim before spraying assembled equipment. When in doubt, spray a hidden area first and wait, since damage shows as clouding or softening rather than immediate failure.
Application technique
Short bursts beat long floods: a flood can push debris deeper into housings and waste product, while bursts with drying time between them clean progressively. Work switches through their range after spraying so the formula reaches the full contact surface.
Power and ventilation
Always power equipment off and unplug it before spraying, and allow full drying before powering back on, since solvents are flammable and conductive while wet. Work in ventilation and wear gloves, especially with aerosol solvents in enclosed spaces.
When cleaning will not help
Cleaning cannot fix worn-out contacts, broken solder joints or failed components. If a switch still fails after deoxidizing and exercising, the contact material itself may be worn, and replacement rather than repeated cleaning is the honest fix.
Contact cleaner formula data
Sizes and formula claims below are maker figures from each listing. Match the formula to the contact type, not just the can size.
| Cleaner | Size | Formula | Source |
|---|---|---|---|
| CRC QD 05103 | 11 oz | Residue-free, plastic-safe | CRC listing |
| WD-40 Specialist | 11 oz | Residue-free, Smart Straw | WD-40 listing |
| DeoxIT D5S-6 | 5 oz | 5 percent deoxidizer | CAIG listing |
| MG 801B | 4.5 oz | Lubricated, plastic-safe | MG Chemicals listing |
| DeoxIT 2-pack | 5 oz each | Cleaner plus FaderLube | CAIG listing |
Contact cleaners by budget
| Tier | What you get | Example pick |
|---|---|---|
| Bulk workshop | Large cans for frequent board and switch cleaning | CRC QD / WD-40 Specialist |
| Precision work | Targeted deoxidizing for switches and audio gear | DeoxIT D5S-6 |
| Complete kit | Two-step clean and lubricate for audio maintenance | DeoxIT 2-pack / MG 801B |
Types of contact cleaners compared
| Type | Pros | Cons | Best for |
|---|---|---|---|
| Residue-free spray | Bare clean finish, fast drying | No lubrication for moving parts | Boards and static connectors |
| Deoxidizing spray | Dissolves oxide layers | Small cans, targeted use | Scratchy switches and audio gear |
| Lubricated cleaner | Cleans and protects moving contacts | Film may attract dust on boards | Relays and selector switches |
| Two-step kit | Complete clean plus lubricate | Higher cost, two cans | Audio maintenance |
Detailed reviews: contact cleaners
Each pick below is a contact cleaner with a verified listing, so the comparison stays on size, formula and contact type rather than guesswork.
Best Overall: CRC QD Electronic Cleaner 05103
Best Overall — the fast residue-free electronics cleaner
Why the CRC QD 05103 is our pick
The CRC QD Electronic Cleaner is the classic workshop choice for a reason: an 11 oz can of fast-drying, residue-free spray that is plastic-safe on most electronics, so it suits circuit boards, connectors, switches and controls without leaving a film behind. Fast drying matters because it shortens the wait before powering equipment back on, and the residue-free formula means contacts stay clean rather than collecting a new layer of grime. One caution belongs in print: some listing mirrors note this item as discontinued by the manufacturer, so check availability before ordering and have the WD-40 Specialist spray as a fallback. For general electronics cleaning, though, this remains the benchmark pick.
CRC QD 05103 key specs
- Brand: CRC
- Part number: 05103
- Size: 11 oz
- Drying: Fast-drying
- Residue: Residue-free by maker description
- Plastic safety: Plastic-safe by maker description
- Use: Electronics, connectors, switches, controls
- Availability note: Some listing mirrors note discontinued by manufacturer
- Form: Aerosol spray
- Kit type: Electronic cleaner
CRC QD 05103: fits and best for
Best for general electronics, connector and switch cleaning where a residue-free finish matters.
CRC QD 05103 pros and watch-outs
- Fast-drying formula shortens downtime
- Residue-free finish keeps contacts clean
- Plastic-safe on most electronics
- 11 oz can covers many cleaning jobs
- Availability varies; some mirrors list it as discontinued
- No lubricant for moving contacts
- Aerosol needs ventilation during use
CRC QD 05103: what owners report
Owners report clean switches and controls with no residue left behind (owner discussion on the listing).
Owners like the fast drying before powering equipment back on (owner discussion on the listing).
CRC QD 05103: who should not buy
Skip it if availability is uncertain in your region; the WD-40 Specialist spray is the direct fallback.
CRC QD 05103: pair it with
Pair it with lint-free swabs for cleaning inside tight connector housings.
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Spray in short bursts and let the solvent flash off before powering on. Top Best Wheel Cleaning Kit for Cars
Best Workshop Spray: WD-40 Specialist Contact Cleaner
Best Workshop Spray — the workshop contact cleaner with precise aim
Why the WD-40 Specialist is our pick
The WD-40 Specialist Contact Cleaner brings the same 11 oz size and residue-free cleaning as the CRC pick, with the addition of the Smart Straw applicator that flips between a wide spray and a precise stream. That precision matters on crowded boards and inside switch housings, where a wide spray wastes product and risks blowing debris deeper into the assembly. One listing notes dielectric strength over 25,000 volts, which suits work around energised-adjacent components, though power should always be off during cleaning. For a workshop shelf where one can must serve boards, switches and controls, the Smart Straw makes this the most versatile spray here.
WD-40 Specialist key specs
- Brand: WD-40 Specialist
- Part number: WD-40 Specialist
- Size: 11 oz
- Applicator: Smart Straw, spray or stream
- Residue: Residue-free
- Dielectric strength: Over 25,000 volts per one listing
- Use: Electronics, switches, controls, boards
- Drying: Fast-drying by maker description
- Form: Aerosol spray
- Kit type: Workshop contact cleaner
WD-40 Specialist: fits and best for
Best for workshop use where precise application on boards, switches and controls matters.
WD-40 Specialist pros and watch-outs
- Smart Straw gives spray or precise stream
- Residue-free finish suits electronics
- 11 oz can covers many jobs
- High dielectric strength noted in one listing
- No lubricant for faders and moving contacts
- Aerosol needs ventilation during use
- Stream setting can blow loose debris deeper if misaimed
WD-40 Specialist: what owners report
Owners like the Smart Straw for reaching tight switch housings (owner discussion on the listing).
Owners report clean contacts with no residue after drying (owner discussion on the listing).
WD-40 Specialist: who should not buy
Skip it for faders and potentiometers that need lubrication; the DeoxIT 2-pack covers those.
WD-40 Specialist: pair it with
Pair it with compressed air to blow out loosened debris after spraying.
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Use the stream setting for housings and the spray setting for open boards. Best Professional Wheel Cleaning Kits Gas Station
Best Precision Cleaner: CAIG DeoxIT D5S-6 Contact Cleaner
Best Precision Cleaner — the precision deoxidizer for switches
Why the DeoxIT D5S-6 is our pick
The CAIG DeoxIT D5S-6 is the precision instrument of this group: a 5 oz spray with a 5 percent deoxidizing formula designed to dissolve oxidation on metal contacts rather than merely wash them. That distinction matters for scratchy audio switches, intermittent connectors and ageing controls, where the fault is an oxide layer that a plain solvent may not remove. The smaller can suits targeted work rather than bulk cleaning, and the DeoxIT name carries long standing among audio and electronics technicians. For restoring a scratchy switch or an intermittent connector, this is the specialist pick, not the bulk workshop spray.
DeoxIT D5S-6 key specs
- Brand: CAIG
- Part number: D5S-6
- Size: 5 oz
- Formula: 5 percent deoxidizing spray
- Use: Switches, connectors, controls, audio gear
- Action: Dissolves oxidation on metal contacts
- Form: Aerosol spray
- Kit type: Precision contact cleaner
- Audience: Audio and electronics technicians
DeoxIT D5S-6: fits and best for
Best for scratchy switches, intermittent connectors and oxidised controls needing deoxidizing action.
DeoxIT D5S-6 pros and watch-outs
- Deoxidizing formula attacks oxide layers directly
- Suits audio switches and ageing controls
- Precise 5 oz size for targeted work
- Long-standing technician reputation
- 5 oz is small for bulk cleaning jobs
- No lubricant for faders in this single can
- Costs more per ounce than bulk sprays
DeoxIT D5S-6: what owners report
Owners report scratchy switches clearing after DeoxIT treatment (owner discussion on the listing).
Owners use it for ageing audio gear connectors and controls (owner discussion on the listing).
DeoxIT D5S-6: who should not buy
Skip it for bulk board washing; the CRC or WD-40 11 oz cans are more economical there.
DeoxIT D5S-6: pair it with
Pair it with the FaderLube companion spray for faders and potentiometers.
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Work the switch through its range after spraying so the formula reaches the contact surfaces. Automotive Tool Chest Reviews
Best Lubricated Cleaner: MG Chemicals 801B Super Contact Cleaner with PPE
Best Lubricated Cleaner — the cleaner that also lubricates contacts
Why the MG 801B is our pick
The MG Chemicals 801B Super Contact Cleaner answers a different problem from the residue-free sprays: contacts that need both cleaning and light lubrication to keep moving smoothly. The 4.5 oz aerosol is plastic-safe by maker description and carries a polyphenyl ether lubricant, which suits switches and connectors that see mechanical wear as well as oxidation. The kit includes PPE, a useful reminder that aerosol solvents deserve gloves and ventilation. For equipment with moving contacts, such as selector switches and relays that cycle often, a lubricated cleaner protects the contact surface after cleaning rather than leaving it bare.
MG 801B key specs
- Brand: MG Chemicals
- Part number: 801B-125G
- Size: 4.5 oz
- Lubricant: Polyphenyl ether lubricant
- Plastic safety: Plastic-safe by maker description
- Includes: PPE in the kit
- Use: Switches, relays, moving contacts
- Form: Aerosol spray
- Kit type: Lubricated contact cleaner
- Action: Cleans and lightly lubricates
MG 801B: fits and best for
Best for moving contacts, selector switches and relays that need cleaning plus lubrication.
MG 801B pros and watch-outs
- Lubricant protects contacts after cleaning
- Plastic-safe formula suits electronics
- PPE included for safe handling
- Suits relays and cycling switches
- 4.5 oz is the smallest can here
- Lubricant residue may not suit every board
- Not the choice for residue-free-only jobs
MG 801B: what owners report
Owners use it for switches that need smooth mechanical action after cleaning (owner discussion on the listing).
Owners note the plastic-safe formula for electronics housings (owner discussion on the listing).
MG 801B: who should not buy
Skip it where a strictly residue-free finish is required; the CRC or WD-40 sprays suit those jobs.
MG 801B: pair it with
Pair it with nitrile gloves and ventilation for safe aerosol use.
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Apply sparingly on moving contacts: a light film protects, a flood attracts dust. Best Automotive Wiring Kits vs Tools
Best Two-Step Kit: DeoxIT D5S-6 and FaderLube F5S-H6 Two-Pack
Best Two-Step Kit — the clean-and-lubricate pair for audio gear
Why the DeoxIT 2-Pack is our pick
The DeoxIT two-pack pairs the D5S-6 cleaner with FaderLube F5S-H6, giving audio and electronics owners the complete two-step treatment: deoxidize first, then lubricate faders, potentiometers and moving controls so they move smoothly and stay quiet. Each can is 5 oz, so the pair covers a full bench session on mixers, amplifiers and vintage gear without buying two separate products. For anyone maintaining audio equipment, this is the most complete kit here, since a cleaner alone leaves faders dry and a lubricant alone cannot remove oxidation. The pair costs more than a single bulk spray, but it solves the whole problem rather than half of it.
DeoxIT 2-Pack key specs
- Brand: CAIG
- Part number: D5S-6 plus F5S-H6
- Sizes: 5 oz each
- Step 1: DeoxIT D5S-6 deoxidizing cleaner
- Step 2: FaderLube F5S-H6 lubricant
- Use: Faders, potentiometers, audio switches, controls
- Form: Two aerosol sprays
- Kit type: Two-step clean and lubricate kit
- Audience: Audio gear owners and technicians
DeoxIT 2-Pack: fits and best for
Best for audio gear, mixers and amplifiers needing both deoxidizing and fader lubrication.
DeoxIT 2-Pack pros and watch-outs
- Complete two-step treatment in one purchase
- FaderLube keeps faders smooth after cleaning
- 5 oz cans suit bench sessions
- Purpose-built for audio maintenance
- More expensive than a single bulk spray
- Overkill for simple board washing
- Two cans to store and track
DeoxIT 2-Pack: what owners report
Owners use the pair for full mixer and amplifier servicing (owner discussion on the listing).
Owners report quieter faders after the two-step treatment (owner discussion on the listing).
DeoxIT 2-Pack: who should not buy
Skip it for general workshop cleaning; a single 11 oz spray is more economical there.
DeoxIT 2-Pack: pair it with
Pair it with cotton swabs for cleaning fader tracks before lubricating.
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Clean first, then lubricate: reversing the order traps oxidation under the lubricant. Best Emergency Escape Tools Under 20
Spec comparison
| Spec | CRC QD 05103 | WD-40 Specialist | DeoxIT D5S-6 | MG 801B | DeoxIT 2-Pack |
|---|---|---|---|---|---|
| Size | 11 oz | 11 oz | 5 oz | 4.5 oz | 5 oz each |
| Formula | Residue-free | Residue-free | Deoxidizer | Lubricated | Clean+lube |
| Plastic-safe | Yes | Not published | Not published | Yes | Not published |
| Applicator | Standard | Smart Straw | Standard | Standard | Standard |
| Drying | Fast | Fast | Not published | Not published | Not published |
| Best for | General | Workshop | Switches | Moving | Audio gear |
| Part number | 05103 | Specialist | D5S-6 | 801B-125G | D5S-6+F5S |
| Includes | Spray only | Spray only | Spray only | PPE | Two sprays |
| Availability | Check stock | Wide | Wide | Wide | Wide |
| Check Price |
Cleaning process and tips
Start by powering off and unplugging the equipment, then remove loose dust with compressed air so spraying does not drive debris deeper. Apply the cleaner in short bursts, work switches and controls through their full range, and allow complete drying before powering back on. For faders, clean the track first and lubricate second, since reversing the order traps oxidation under the lubricant film.
Test the equipment after cleaning and repeat only if the fault persists; repeated spraying without improvement usually means wear or a failed component rather than dirt. Keep a note of which cleaner suits each device, since boards, switches and faders need different formulas. See Best Fastener Assortments Tool Set and Adjustable Wrenches Reviews Best Brands for related cleaning tool reading, and Best Bidirectional Scan Tool Under 300 for workshop storage options.
Safety essentials
- Always power off and unplug equipment before spraying cleaners.
- Allow full drying before powering equipment back on.
- Work in ventilation; aerosol solvents are flammable.
- Wear gloves and eye protection when spraying aerosols.
- Never spray into a live outlet, panel or energised assembly.
- Keep cleaners away from open flames and hot surfaces.
Accessory pick: Dust-Off Disposable Compressed Gas Duster DPSXL (10 oz) — for pre-cleaning dust removal.
Accessory pick: AMMEX Black Nitrile Exam Gloves (box of 100, 3 mil) — for safe aerosol handling.
Accessory pick: AAwipes ESD Foam Swab Sticks E750DF — for cleaning connector housings without shedding fibres.
Troubleshooting
| Symptom | Likely cause | Fix |
|---|---|---|
| Switch still scratchy | Oxidation deeper than surface dirt | Repeat deoxidizing and exercise the switch fully |
| Fault returns quickly | Worn contact material, not dirt | Replace the switch rather than re-cleaning |
| Residue left behind | Wrong formula for the job | Use a residue-free spray for boards |
| Plastic clouded | Solvent attacked housing plastic | Stop use, check plastic-safe claims first |
| Spray blows debris deeper | Long flood instead of bursts | Use short bursts and pre-clean with air |
| Equipment will not power on | Still wet or cleaner in a socket | Allow longer drying and inspect for pooling |
Who should NOT buy these
Anyone cleaning live or energised equipment should not spray at all. Contact cleaners are for powered-off equipment only, and wet solvent near live parts is dangerous. Power off, unplug and dry fully; see About WinchInsider for electrical safety reading.
Owners of worn-out switches should not expect cleaning to restore them. When contact material is worn away, no cleaner rebuilds it. Replacement is the honest fix after one proper deoxidizing attempt.
Buyers needing only bulk board washing should skip the precision kits. DeoxIT two-packs and lubricated cleaners cost more per ounce and solve problems a bulk spray handles cheaper.
Anyone sensitive to aerosols should avoid spray cleaners. Pump or wipe alternatives exist for light cleaning, and ventilation plus gloves are mandatory for aerosol use.
Final verdict
Best Overall: CRC QD Electronic Cleaner 05103 — Check its price.
Best Workshop Spray: WD-40 Specialist Contact Cleaner — Check its price.
Best Precision Cleaner: CAIG DeoxIT D5S-6 Contact Cleaner — Check its price.
Best Lubricated Cleaner: MG Chemicals 801B Super Contact Cleaner with PPE — Check its price.
Best Two-Step Kit: DeoxIT D5S-6 and FaderLube F5S-H6 Two-Pack — Check its price.
FAQ
What is the best contact cleaner?
For general electronics, the CRC QD Electronic Cleaner is the benchmark for fast residue-free cleaning, while DeoxIT D5S-6 suits oxidised switches and the WD-40 Specialist spray suits workshop versatility with its Smart Straw. Match the formula to the contact type.
Does contact cleaner leave residue?
Residue-free sprays such as CRC QD and WD-40 Specialist leave no film by maker description, while lubricated cleaners intentionally leave a protective film for moving contacts. Choose residue-free for boards and lubricated for faders and relays.
Is contact cleaner safe for plastics?
Many electronics cleaners, including CRC QD and MG 801B, are described as plastic-safe, but not every solvent is. Check the listing claim and test a hidden area first when spraying assembled equipment with plastic housings.
Can contact cleaner fix a scratchy volume knob?
Often yes, when the fault is oxidation on the potentiometer track. Spray a deoxidizing cleaner into the control, work it through its range, and follow with a fader lubricant for lasting smooth action.
How long does contact cleaner take to dry?
Fast-drying sprays dry within minutes, but always allow full drying before powering equipment back on. Trapped solvent in housings dries slower than solvent on open boards, so wait longer for enclosed assemblies.
CRC or WD-40 contact cleaner?
Both are 11 oz residue-free sprays for general electronics work. CRC QD is the established benchmark, while WD-40 Specialist adds the Smart Straw for precise application in tight housings.
What is DeoxIT used for?
DeoxIT is a deoxidizing cleaner for metal contacts in switches, connectors and audio gear, where oxidation causes scratchiness or intermittent faults. FaderLube pairs with it for lubricating faders after cleaning.
Can I spray contact cleaner on a live circuit?
No. Always power off and unplug equipment before spraying, since solvents are flammable and conductive while wet. Allow complete drying before restoring power.
Why is CRC QD listed as discontinued in some places?
Some listing mirrors note CRC QD Electronic Cleaner as discontinued by the manufacturer, while other listings still show stock. Check availability before ordering, and keep the WD-40 Specialist spray as a fallback.
Sources
- CRC QD 05103 listing on Amazon (ASIN B000BXOGNI)
- WD-40 Specialist listing on Amazon (ASIN B00AJX7OGQ)
- DeoxIT D5S-6 listing on Amazon (ASIN B00006LVEU)
- MG Chemicals 801B listing on Amazon (ASIN B001U3X3PA)
- DeoxIT 2-pack listing on Amazon (ASIN B00HNV7WI2)
By Leo, Founder, WinchInsider
Leo covers automotive gear with a research-first approach, comparing maker specifications and owner reports before recommending any product.
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Top pick: CRC QD Electronic Cleaner 05103 Check Price