All of the above
My favorites are DP Xtreme Foam, Poorboys SS (used today for the first time in a while and loved it---very slick, tons of suds), DG 901.......not in any particular order.
Drought restrictions here in Georgia forced me to find a new/different way to wash the cars and after buying and testing many "waterless" products No Rinse is my winner with QEW being runner up.
Eco-Friendly and by using NR I also save 2,400 gallons of clean drinking water compared to hose washing my car once a month over a year.
I was just about to order some Poorboys SS&S because I noticed it is non-toxic/biodegradeable whereas DG 901 did not mention anything along those lines. According to the nice folks at Duragloss headquarters, 901 is 100% non-toxic/biodegradeable also.
Time to pick up a gallon of 901 for $25, instead of a quart of PB SS&S for $15.