microfibers are really made of polyester and nylon (polyamide). but these fibers are woven so fine. that they are safe for your paint. what will cause it to scratch the paint is the dust or dirt that is picked up by the MF cloth, so when buffing you have to use MF towels with more nap. and do not apply too much pressure on the towel.
as for the 3m chamois cloth i use it too on my car along with my jellyblade. i use one for upper parts and another for the lower parts.






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