CarCareTruth Score
Decent, but it's tough on the environment.
Opens Amazon in a new tab. No account needed to look.
Saved to your guest loadout. Sign up to also save to your Cabinet (consumables) or Kit (tools you own).
As an Amazon Associate I earn from qualifying purchases. Full disclosure
Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 1 aspiration toxicity — thin, oily liquids can slip into the lungs if swallowed, causing chemical pneumonia.
GHS Category 1 reproductive toxicity — classified as suspected of damaging fertility or harming an unborn child.
If swallowed, inhaled, or splashed in eyes:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
Health score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
Show details for all categories ▾Hide details ▴
From the manufacturer’s Safety Data Sheet, Section 8
“SDS Section 2 classifies the mixture with H319 (Serious Eye Irritation Cat 2A). Aerosol mist at face level during engine-bay work can reach the eyes. SDS Section 8 specifies eye protection.”
— CRC
U.S. regulatory standard
29 CFR 1910.133(a)(1)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals…”
ANSI Z87.1 (incorporated via §1910.6)
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“SDS Section 2 classifies Skin Irritation Cat 2 (H315). The petroleum distillate solvent base with repeated or prolonged handling warrants chemical-resistant gloves. SDS Section 8 lists skin protection as a control measure.”
— CRC
U.S. regulatory standard
29 CFR 1910.138(a)
“appropriate hand protection when employees' hands are exposed to hazards such as those from… chemicals which produce an adverse effect on the skin or eyes…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“DANGER signal word is driven by health H-codes (H304 aspiration hazard, H360 reproductive toxicity, H370 STOT-SE Cat 1), not flammability alone. The petroleum distillate aerosol at close range and face level · combined with a high vapor pressure (5614.8 hPa) · means SDS §8 calls for adequate ventilation and respiratory protection in poorly ventilated spaces. The inhalation risk is chemistry-based, not generic SDS boilerplate.”
— CRC
U.S. regulatory standard
29 CFR 1910.134; 1910.138; 1910.1000
“the primary objective shall be to prevent atmospheric contamination… When effective engineering controls are not feasible… appropriate respirators shall be used.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
The published Safety Data Sheet for this product does not specify ventilation protection for consumer use.
Workplace context
29 CFR 1910.134(a); 1910.1000
“the primary objective shall be to prevent atmospheric contamination [via] accepted engineering control measures (for example, enclosure or confinement of the operation, general and local ventilation…).”
Triggered by GHS H336 on the SDS.
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
This product ranks #1 of 5 in MAF Sensor Cleaner.
Last reviewed June 12, 2026
TL;DR CRC 05110 is the community reference pick for MAF sensor cleaning · broadly trusted by owners, and BITOG threads confirm fouled sensors return to spec voltage after a spray-and-air-dry. It evaporates completely without residue, and the label confirms compatibility with hot-wire elements and plastic housings. The DANGER signal word is driven by health H-codes · not just flammability · putting it in a higher hazard class than simpler aerosol cleaners. Eye protection and fresh air are the chemistry-based minimum.
Remove the MAF sensor, hold it element-side down, spray two to four short bursts at the sensing element using the straw, and air-dry two to three minutes before reinstalling. The formula evaporates completely · no oily residue. BITOG threads and a large, highly rated base of codes stay cleared across hot-wire and hot-film sensors on multiple platforms. One can covers multiple sessions.
The right pick for a home mechanic who pulled a P0101 or P0102 code · CRC 05110 is the product other forum threads compare against. It reliably cleans lightly to moderately fouled sensors from PCV oil mist and intake dust. Skip it if the sensor is visibly oil-soaked from a heavily over-oiled cold-air intake filter; that level of contamination usually means sensor replacement regardless of cleaner. Also note CARB non-compliance: cannot be legally sold in California or other OTC-regulated states.
DANGER here is driven by health H-codes · H304 aspiration hazard, H360 reproductive toxicity (methanol), H370 STOT-SE Cat 1 · not flammability alone, which puts it in a higher hazard class than IPA-based cleaners. Prop 65 warning confirmed. Eye and skin protection are warranted; use outdoors or with the garage door open. See frontmatter for full GHS codes and PPE tiers. Environmentally: not CARB compliant (~665 g/L VOC), H411 aquatic toxicity, no biodegradability data.
The product label explicitly states compatibility with hot-wire, hot-plate, and plastic sensor types. The formula uses fast-evaporating light aliphatic hydrocarbons that do not leave an oily residue and do not attack ABS, nylon, or polypropylene · the common housing plastics on Bosch and Denso sensors. Community forum threads on BITOG and owner reviews across multiple vehicle platforms (Jeep TJ, Ram Ecodiesel) confirm codes clear and MAF voltage returns to spec. No element-damage reports were identified in community research.
The DANGER signal word here is driven by health H-codes in the SDS Section 2 mixture classification · specifically H304 (aspiration hazard), H360 (reproductive toxicity Cat 1A from methanol), and H370 (STOT-SE Cat 1 · causes damage to organs). This is meaningfully different from the DANGER signal word on IPA-based aerosols, which are classified DANGER only from aerosol flammability. The petroleum distillate and methanol chemistry in CRC 05110 drives a higher health hazard profile than formulas with a simpler solvent base.
Yes. SDS Section 15 lists ethylbenzene (carcinogen, listed 2004), methanol (developmental toxin, listed 2012), toluene (developmental toxin, listed 1991), and n-hexane (male reproductive toxin, listed 2017) under Prop 65. The Rainforest API product data confirms the Prop 65 warning is present on the listing.
No. The product listing explicitly states 'Not VOC Compliant for California & OTC.' SDS Section 15 confirms VOC content of 95% by weight under both EPA and California accounting. The petroleum distillate solvent formula has no exempt-solvent accounting available.
Yes. CRC Industries publishes the SDS at https://www.crcindustries.com/media/msdsen/msds_en-1003729.pdf · the URL pattern uses the SDS item number (1003729). The current version is 01, issue date 2021-08-19. CarCareTruth has the SDS on file in Supabase Storage and scoring is derived directly from this document.
Marketing copy from CRC, via Amazon. Not editorial.
Weekly pick
One product, one safety verdict, every week. No spam.
![CRC Brakleen 1003695 Brake Cleaner Spray Non-Chlorinated Low VOC, 14 oz, [1 Pack]](https://m.media-amazon.com/images/S/aplus-media-library-service-media/0630b636-c08b-4c87-b899-a03b561762a2.__AC_SR166,182___.jpg)
![CRC Brakleen 1003712 Brake Parts Cleaner Non-Flammable, 1 Gallon, [1 Pack]](https://m.media-amazon.com/images/S/aplus-media-library-service-media/26680aad-c924-4969-bd57-46a7dbda69d7.__AC_SR166,182___.jpg)
![CRC 05483 Heavy Duty Pro-Strength Degreaser, 20 Wt Oz, [1 Pack]](https://m.media-amazon.com/images/S/aplus-media-library-service-media/1be41759-25ef-4db9-bfd2-1523e474b358.__AC_SR166,182___.jpg)
![CRC Knock’er Loose Penetrating Solvent 03020 – [Reddish] 13 WT. Oz., Industrial Grade Penetrating...](https://m.media-amazon.com/images/S/aplus-media-library-service-media/db37919d-87cd-4cf1-8062-781565e955ec.__AC_SR166,182___.jpg)
Johnsen's
4721 Mass Air Flow Sensor Cleaner
Gumout
Professional Formula Mass Air Flow Sensor Cleaner
As an Amazon Associate I earn from qualifying purchases. Full disclosure
Community
0 postsShare how you use this product
Drop a quick comment or post a full review with photos and a star rating.
Sign in to postNew here? Create a free account.