Now for something called a "Foam Bath". I use a foam cannon attached to a power washer. I did two of these on my C63. The first, as pictured, I use a soap called Chemical Guys Citrus Wash. This removes ALL waxes and sealants on the paint. This is essential as part of the prep. Always use a power washer to rinse. Once you rinse the car, you will see a "sheeting" instead of "beading" water. You can rinse the water once all the soap is basically off the car.