My company installed a truck wash. The rinse is hot water softened and filtered. It has a pre-soak, soap, rinse...and the final rinse which is the soften/filtered water. No water spots on my black rig at all. The soap is pretty good as well. You really don't need to broom the rig if it isn't all that dirty. We have a fire hose feature as well for the really hard to get off mud and such. But you don't want to get close to any paint or it will remove it as well.....