The Best Car Wash Soaps (Review & Buying Guide) 2020
The more the concentration of the product, the longer it will last. A good soap to water ratio would be 1 ounce for 1 gallon of water. Most bottles come in ounces divisible by 8 such as 16, 32, 48, and 64. pH Level. A car wash soap’s pH level determines the acidity or alkalinity of the product.