CarCareTruth Score
Decent, but wear gloves and ventilate.
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The 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 eye damage — classified as causing irreversible eye damage on contact.
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.
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From the manufacturer’s Safety Data Sheet, Section 8
“The SDS carries H318 (serious eye damage, Cat 1) at the mixture level, driven by the cocamidopropyl betaine surfactant. GHS05 pictogram confirmed in SDS §2. Eye protection is required when handling concentrate or during foam-cannon application where overspray can reach face level.”
— Gtechniq
U.S. regulatory standard
29 CFR 1910.133(a)(1); 1910.151(c)
“The employer shall ensure that each affected employee uses appropriate eye or face protection when exposed to eye or face hazards from… liquid chemicals, acids or caustic liquids…”
ANSI Z87.1 (chemical splash protection — 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 carries H315 (skin irritation, Cat 2) at the mixture level. Foam-cannon application keeps hands largely dry during dwell and rinse. The realistic skin exposure window is concentrate pouring and foam-cannon filling · nitrile gloves during those steps cover the risk.”
— Gtechniq
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
“No H335 in the SDS; water-base surfactant formula applied via foam cannon outdoors carries no meaningful inhalation pathway. Situational tier covers carport or enclosed-garage use where foam mist can accumulate.”
— Gtechniq
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
Last reviewed June 14, 2026
TL;DR A gentle citrus snow foam for foam-cannon pre-wash, confirmed coating-safe and biodegradable at 1:10 dilution. Community reviews confirm visible road-film lift before the contact wash. The SDS carries a DANGER signal word at concentrate strength: wear safety glasses when filling the lance.
Load a foam cannon at 1:10 to 1:15 and let the product dwell 3 to 5 minutes. owners describe foam that clings to vertical panels and visibly suspends grime during dwell; an owner documents cling lasting over 10 minutes. Gtechniq markets W4 as the companion pre-wash for their ceramic coatings, and community use on Crystal Serum Ultra confirms no stripping at labeled dilution. It is a gentle formula, not an aggressive TFR; heavily contaminated vehicles still need a contact wash after.
Best fit for ceramic-coated or waxed vehicles where an alkaline TFR would strip the protection. Skip it for heavy insect protein, tar, or road salt; those need a dedicated bug-and-tar treatment or iron remover before the foam step.
The SDS carries a DANGER signal word from a serious eye-damage classification at concentrate strength. Wear safety glasses when pouring and filling the lance; nitrile gloves make sense when measuring concentrate. No solvents, no inhalation concern outdoors. Rinse runs to storm drain; both surfactants show aquatic toxicity at ingredient level, but the SDS confirms the product is fully biodegradable.
Gtechniq's labeled guidance is approximately 1:10 to 1:15 for foam cannon and 1:5 to 1:10 for a bucket pre-wash. UK Detailing World community practice centers on 1:10 as the standard starting point for foam cannon. Some owners report needing more product than label guidance with certain foam lances, so dilution sensitivity varies by equipment. Start at 1:10 and adjust to your setup.
Yes. Gtechniq explicitly markets W4 as coating-safe and the formula is non-caustic with no alkaline builders (NaOH/KOH). Community reviews consistently document use on Gtechniq Crystal Serum Ultra and other ceramic-coated vehicles with no protection degradation. The pH-neutral marketing claim is consistent with the ingredient chemistry, though Gtechniq does not publish a working-dilution pH in the SDS.
The DANGER signal word comes from the cocamidopropyl betaine surfactant, which causes serious eye damage (Cat 1) at concentrate strength · the same GHS classification you see on many household cleaning concentrates. At the labeled 1:10 foam-cannon dilution, the effective surfactant concentration drops enough that the working-dilution hazard level is likely lower, but Gtechniq does not publish a working-dilution SDS classification. The label says DANGER for the concentrate, which is what the SDS covers. Wear eye protection when handling and filling the lance bottle.
No. The SDS lists only two active ingredients · a secondary alkane sulfonate and cocamidopropyl betaine. The citrus character comes from fragrance only; there is no d-limonene in the formula. This matters for aquatic toxicity: d-limonene is a known aquatic toxicant and its absence is a positive for drain-destination rinsate.
Marketing copy from Gtechniq, via Amazon. Not editorial.
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