Foam guns (cannons) have their pros and cons. I recently had a client ask me about this and said that his foam cannon wasn't doing a good job in foaming up. He had a power washer setup and a Amazon $20 deal. Soap wise he was using Meguiars Gold class soap. That being said the first issue is the soap mix is the most critical. Meguiars Gold Class is not an ideal soap for foam guns period. Lots of other brands out there that are designed to do this but that is another topic. My recommendation is a simple two bucket wash takes precedence over a foam gun unless your car is extremely dirty (Read: trail dirt, mud etc...) or you have intentions of stripping wax off the paint (Which is what I use a foam gun for). The process of foaming your car is for a pre soak process only and cannot be substituted for a wash.

<u>