Z7 in Foamgun

I have used it and while it make a nice foam I don't think its very economical. I've recently switched to DP (from AG) whiche is considerably cheaper and really foams up nicely.
 
I put about an ounce into the foam gun, add water, and even on the setting that provides the most suds, I have enough to do my mid-sized SUV. An even better idea would be to dilute the correct amount of Z7 to one gallon of water, and use that to fill up the foam gun.
 
I like Z7 in my foam gun. My ratio I believe is 1:1. However, its not very economical. I had some Z7 sitting around when I ran out of SS&S. When I get close to using up my Z7, I will be ordering a gallon of SS&S!
 
a foam guns primary purpose is to foam, let soak and soften most of the dirt on the surface. And then to rinse off. So I would be looking for an inexpensive but good sudsy cleaning shampoo. I would save the boutique kind of shampoos (Z-7, Sonax, P21S, Griot's, Zymol, #00, 1Z) for the final wash. Again that's me.
 
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