Originally Posted by Rival
id do this. use the sprayer, hose down the car, wash, rinse.
Than in your parking lot, a friends driveway, whatever.... use a waterless or rinsless wash. vac interior, windows, polish, etc etc
This is what I do, and I stay away from the brushes and soaps for sure. Most car wash places don't mind as long as its not the busy time.
Oh, and have fun filling the soap and rinse buckets, its a challenge getting those filled with the power wash wand and not soaking yourself.