Researched as the default-recommendation pH-neutral shampoo for coated and waxed paint, with the largest review base in the category at 22,500-plus ratings. It suds heavily in a foam cannon or bucket without stripping sealant, though it is a pure cleaner with no gloss or protection additives.

Researched as the best value in the category: a full gallon of wash-and-conditioner formula for $17.98, or roughly 14 cents an ounce. The conditioners leave a slightly slicker, glossier finish than a plain shampoo, which is why it rates 4.7 across nearly 13,000 ratings.

Researched as the enthusiast-brand pick: a pH-neutral gallon that produces thick, slick foam and rinses spot-free, aimed at owners who wash weekly and want a boutique detailing formula. You pay a premium over Meguiar's for effectively the same neutral, coating-safe chemistry.

Researched as the specialist choice for a foam-cannon pre-wash: a high-foaming, pH-neutral snow foam meant to blanket the car in thick suds that soften and lift grit before contact. It is a maintenance/pre-soak soap rather than an all-in-one bucket shampoo.