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I didn't run any experiments with a control factor, but I used to use a duster religiously on my grey '15 Mustang GT, which always had a coat of Carpro Cquartz UK ceramic coating, applied once per year. I was careful to not apply pressure with the California duster, and I only dusted once per day. I found what I felt were too many scratches on the paint. I also use a two-bucket method for washing, and that was only maybe once per week at most (usually less).
I also watched a few reviews and many reviewers concluded that what is supposed to attract and lift the dust with a California Duster causes dust to stick to it after more than 1 use, and they felt it caused scratches.
I do not use a duster anymore, and my car is always dusty and I hate it. Not sure what the long term solution will be.
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