You are supposed to rinse the foam off before you continue with the 2 bucket method. The foam is to help loosen the dirt on your rig. (I actually use 3 buckets: soapy water, soapy water for wheels/tires, and clean rinse water.) If you don’t rinse before scrubbing, you take a change of grinding those dirt particles into your clear coat causing scratches and swirl marks. Of course, it’s up to you. Just my 2¢. Sent from my iPhone using Tapatalk