Yeah, your gonna get surface sratches no matter what you do. Best defense is to make sure you use a good clean sponge or wash mit, and a clean shami to dry. A few good coats of wax always helps. I've seen people use wash brushes, which are killer to the car's finish. Also, some people use those blades to dry their cars, and if used incorrectly they can scratch also. Hope this helps.
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