CarCareTruth Score
Decent, but wear gloves and ventilate.
Priced as of June 9, 2026
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Prices may varyAbout 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.
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From the manufacturer’s Safety Data Sheet, Section 8
“SDS §2 classifies the mixture as Eye Irritation Cat 2A (H319). Per rubric PPE table, H319 without H318 places eyes at situational; aerosol mist during spray-in-place use can cause temporary eye irritation on direct contact. SDS §8 specifies safety glasses or goggles as protective equipment.”
— Holley
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
“No H315 skin irritation code is classified in SDS §2 for this formula. However, the aromatic co-solvents (toluene, xylene) and glycol ether (2-butoxyethanol) warrant glove use for repeated or prolonged handling per SDS §8 precautionary statement P280, which directs protective clothing and gloves.”
— Holley
U.S. regulatory standard
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed [in excess of the PEL]…”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
UN GHS hazard statement
H361“Suspected of damaging fertility or the unborn child”
UN GHS Rev. 9 (2021)
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 health-driven. SDS §2 classifies narcosis (H336), suspected carcinogen (H351), suspected reproductive toxin (H361), and STOT-RE (H373). SDS §8 directs P260 (do not breathe spray), P271 (use only outdoors or in well-ventilated area), P280 (wear protective equipment), and P284 (in case of inadequate ventilation, wear respiratory protection). Aerosol form factor combined with the H-code profile requires organic-vapor cartridge respirator when ventilation is insufficient.”
— Holley
U.S. regulatory standard
29 CFR 1910.1000; 1910.1200
“Each employer shall assure that no employee is exposed [in excess of the PEL]…”
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 #6 of 13 in Carburetor Cleaner.Three above it ↓
Last reviewed June 10, 2026
TL;DR A capable aerosol carb cleaner with a fast-evaporating solvent system that handles moderate-to-heavy varnish and gum in one pass, based on SDS chemistry that mirrors well-regarded category performers. The DANGER signal word is driven by genuine inhalation and carcinogen/reproductive-toxin hazard codes: wear safety goggles and nitrile gloves at minimum; the SDS directs an organic-vapor cartridge respirator when garage ventilation cannot be achieved.
Holley's 18 oz aerosol targets varnish, gum, and carbon in carburetor passages, jets, float bowls, and throttle body bores. Insert the straw, spray short bursts, dwell, blow out with compressed air. The solvent system evaporates quickly per SDS §9 data, leaving passages dry and residue-free after air-gun drying. Launched early 2025, independent long-term forum evidence is still accumulating, but the SDS chemistry aligns with established category performers.
The right buy for a home mechanic cleaning a small-engine carb, motorcycle carb, or throttle body that stumbles after sitting on stale fuel. Skip it if the carb has years of lacquered brown-varnish deposits: that calls for an overnight soak in a dedicated carb-dip solution, not aerosol spray.
DANGER is chemistry-driven: SDS §2 classifies narcosis hazard (H336), suspected carcinogen (H351), suspected reproductive toxin (H361), and repeated-exposure organ toxicity (H373). SDS §15 confirms Prop 65 warnings for toluene (reproductive harm) and ethyl benzene (carcinogen). SDS §8 directs use outdoors or in well-ventilated areas only (P271); organic-vapor cartridge respirator required in inadequate ventilation (P284). The primary solvent is CARB/EPA-exempt, making the product CARB-compliant; absolute solvent emissions remain in the 600-700 g/L range regardless.
Brief spray applications on assembled carburetors are the intended use case per the product label. The fast-evaporating formula does not soak rubber long enough to cause significant damage at typical dwell times. For carburetors with heavy varnish requiring extended dwell or soak, disassemble the float bowl and use a dedicated carb-dip solution rated for rubber compatibility; aerosol spray is not a substitute for an overnight soak on severely varnished carbs.
The primary solvent is federally VOC-exempt under EPA regulations, and California's Air Resources Board (CARB) treats it as exempt for the carb-cleaner category. That regulatory exemption is why the product qualifies as CARB-compliant despite high absolute solvent content. The exemption applies to regulatory VOC accounting -- it does not reduce the absolute solvent emissions that reach the atmosphere or your lungs, which remain in the high-VOC bracket.
Yes. The product carries a California Proposition 65 warning per SDS §15. Toluene is listed as a reproductive toxin and ethyl benzene as a carcinogen under Prop 65. Both ingredients appear in SDS §3 at 1-5% (toluene) and 0.1-1% (ethyl benzene).
Yes. Holley publishes SDS documents via a documents portal using SHA-hash filenames. The SDS for this product was located at the Holley documents site and is also stored in CarCareTruth's Supabase media archive. The current revision is dated 2025-01-24, prepared by PLZ Corp.
Marketing copy from Holley, via Amazon. Not editorial.
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