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Foaming then rinsing and foaming again is overkill and wasteful to the enviroment in my opinion. I personally foam an area, then wash that area. Foam another area, wash that area, etc...until the car is completely washed. In my experience if you foam the entire car, by the time you get around to the other side the foam has mostly gone away and is not serving its purpose, which is an extra layer of lubrication.
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