Gtechniq W4 Citrus Foam Shampoo and Degreaser

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. A German reviewer found needing about 50% more product than label guidance with some foam lances — 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.