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LOL. I was on USP and was looking for spray bottles and noticed they had 7 gals. Granted, sometimes if I'm doing the suv, between the CG Cyclone and the GG, most times I get by but there are times...

Just short of your last bullet point - cost per was - which I've never compared, Reset is my go to wash.
Depending on your water conditions, I use about 1.5 - 1.75 oz per bucket.

Other soaps are...