pH-neutral shampoo

A pH-neutral shampoo is formulated to sit close to pH 7, neither strongly acidic nor strongly alkaline, so it lifts everyday dirt and road film without attacking whatever protection is already on the paint. It is the default soap choice for routine washing, as opposed to specialty products like wheel cleaners or tar removers that are deliberately more aggressive for a specific job.

The reason pH matters is that wax, sealant, ceramic and graphene coatings are chemically vulnerable to strong alkaline soaps, which are sometimes marketed as degreasers or heavy duty cleaners. Using one of those as a weekly wash soap can shorten the life of a coating or wax layer far faster than the manufacturer intended, forcing more frequent reapplication than necessary.

When buying, look for wording like pH-neutral or pH-balanced on the label, and check whether it is described as safe for waxed or coated paint. Concentrates should be used at the ratio printed on the bottle rather than poured freely for extra suds. The most common mistake is assuming thick foam means a soap is gentle, when foaming and pH are unrelated, and grabbing a dish soap or wheel cleaner for a full body wash out of convenience.