Car wash soapacts as a cleaning agent to remove dirt and grease to give protection to the car's paint and coat. High foaming soaps allow the surfactants to perform their best. Soaps are excellent for hand, foam guns, and automatic washing systems. Dilution rates vary. TIPS: Use on cool surfaces. To quickly cool the surfaces, rinse entire vehicle with pressurized water before use. This will also help to loosen and remove dirt. It is best to use a separate wash mitt or sponge on the lower body areas, fender wells, wheels, and tires. This way, if you pick up any small rocks and dirt, it won’t scratch the painted areas.