I've tried about twenty or so soaps through my foam cannon now. IME:
DP Extreme Foam: *Great* foam. Totally
LSP safe. You could cover your car in straight dp extreme foam without touching your
lsp. Mediocre cleaninng power.
Zaino Z5(?) can't remember if that's the correct Z number... Anyway, Great foam, good cleaning power. Expensive.
CG's Citrus Wash & Gloss: Very good foam. Fantastic cleaning power, but you have to be careful: mix it too strong and it'll strip your
LSP in a hurry. Cheap. My fav.
I like to mix one ounce of either Zaino or DP extreme in with two ounces of CW&G, then fill up the rest of my cannon's 32 oz. bottle with water. This gives great foam, cleaning power, rinses well, and won't touch your
LSP.