[Setec Astronomy]

Although I almost always set my gun for the "normal" 1 oz/gal as Integrity Detail does (OMG! we agree on something!), many members dilute the soap down much more than that. I probably use 2 or 3 times as much as a bucket wash, I have never taken the time to try to dilute it down more and soak for longer...I have to do that one of these days.

If you're tryin to be "green" by using less soap, and you're in a shop, a pressure washer might be a better way to "pre-wash" and remove most of the dirt without soap. The whole idea of the foam gun is to loosen and float away some of the dirt before you grind it against the paint with your wash media, many pros seem to use a pressure washer for that.