Pat Mike Optimum works, I can't remember the last time I took out a hose to wash my cars, and Pat you've seen my black Crossfire. I use the 2 bucket method to wash off my mit before dunking again in the optimum bucket I make at least 3 fresh buckets to do the whole car that's a total 0f about 12 gls of water so I don't know how much water I'm saving.