Clay Bars and Clay Mitts: Is Dragging Clay Across Paint Safe?
Clay works by shearing embedded particles off. That is a controlled abrasion, and the three ways it goes wrong are all failures of lubrication or of a dropped bar.
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Why Clean Paint Still Feels Rough: The Bag Test
Washing removes what is sitting on the paint. It does not remove what is stuck in it. Those are two different jobs and only one of them is a wash.
