[dsms]

I use a foam cannon through a cam spray pressure washer with CWG all the time. I do not think CWG is strong enough to really break down and REMOVE the dirt pictured in the OP's photos. I do think however a lot of people have the wrong impression of why we pre-foam cars. The idea is simply to loosen and emulsify the dirt on the surface of the finish, that way when you begin your mechanical wash process very little scrubbing is required to achieve a clean, dirt free finish.