At work, we have a lot of mirrors to clean, out in the desert. I am proposing a truck mounted power washing rig, with some kind of pre rinse that is something like environmentally friendly. I don't want to scrub these things, because there is a LOT of them. About 1400 mirrors. :huh But, scrubbing is occasionally necessary, and that's what I am thinking the pre rinse will help with. Suggestions?