P21S High Performance Total Auto Wash (5 L)

P21S built this auto wash around a citrus-based solvent that gives it a wide range of cleaning power depending on how you dilute it. At full or near-full strength around 1:4, it works as a degreaser strong enough to strip diesel soot, wax buildup, and stubborn grime from wheel wells and rocker panels. Diluted out to around 1:125, it becomes a gentle exterior wash that handles everyday dirt without aggressive chemistry.

That dilution range is what makes the 5-liter size practical. A little goes a long way when you are mixing at wash-bucket ratios, so this canister lasts through many washes. The formula works across paint, glass, rubber, chrome, plastic, vinyl, carpet, and even exhaust tips, making it genuinely versatile beyond just exterior washing.

One thing to be aware of: the d-limonene citrus solvent that gives P21S its cleaning power will strip wax and polymer sealants at higher concentrations. If you want to preserve your wax layer, dilute heavily for exterior washing. For decontamination before applying a new coat of wax or sealant, a stronger mix actually works in your favor. The wash leaves behind a fresh orange scent rather than a chemical smell.