Having just visited my uncle's shop in Ohio, this thread should be read..by him! I looked around and saw SO MANY varieties of the same thing. I told my nephew, who runs the shop, that he could do the same work (actually better) with half of what was in there.
Problem? My uncle things that ONR and other like products are all "crap" and scratch cars. He's the ol' "You must use 100 gallons of water" to get it right. Slowly, people are learning and changing.
This might not be popular, but I'm still surprised in CA. at least, that many companies are selling detail trailers with water tanks and pressure washers. I have not used one in over a year. I get local detailers asking me for demos on water(less) products all the time, but they are still skeptical even after I show them.
The other day..new customer..4 nice cars. Boxter was missing the "B" on the back trunk. Pressure washer from previous detailer tore it off and cracked the r on the other end. This car is kept in a garage and kept very clean. ONR out of a bucket is probably too much for washing-

Spray and wipe.
Soap box getting carried away so I'll stop.