Originally posted by Stonewall
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Don't forget the Rain-X windshield coating! It works unbelievably well!
As for the exterior, when I was working at Toyota and later Lexus we (lot attendants and detailers) used water-based automotive soaps and degreasers (applied using a sheepskin mitt) because it breaks down the best while protecting the paint.
Now for your question: the power of the wand wash would be your most likely culprit for stripping away any film coating you have on the exterior, and then the type of soap. Next time you go for the DIY detail: pre-rinse, rinse, foam brush (gentle!), soap, rinse, wax (until it beads away in the immediate area), spot-free rinse. The secret to a detailers clean is the pre-rinsing. That lifts the dirt out of the paint's pores and the brush then soap carries it away. The wand wax will seal the deal until you get home to buff it proper.

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