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I’ve thought about this … but conclude that it isn’t much more or any more harmful than washing your car with the same sponge or wash mitt and along with a hose.
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Well my theory was that a sponge has pores or pockets in it. So if I pick up a piece of grit in a pore of the sponge, that grit will stay there, the sponge will act as a carrier and keep that grit pressed against the car. The brush on the other hand is (theoretically) unable to keep a piece of grit pressed against the paint, the grit would move up between the bristles.
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If the grit doesn't the brush bristles will scratch the paint.
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I did not know that. I am using a dustpan brush with those very soft flayed (flagged) ends. I don't use it for anything else. Thanks for the links.