The chamois itself is a flat surface so when it comes into contact with the surface of the wet car it creates a sort of suction, with no cushion in between the chamois and the paint. ... You'll be dragging that dirt all across the surface of your paint, causing fine scratches.
Is chamois bad for car paint?
REALITY: Far from the truth. Synthetic chamois are actually much worse for your paint, as they lack any knapping ability whatsoever. CLAIM: You need multiple microfiber towels to dry your car, while chamois can be simply wrung out and used again.
How can I dry my car without scratching it?
The best way to dry a car without causing scratches is to use a soft, plush and clean microfiber towel, or a car dryer/ leaf blower. Never use a water blade (squeegee), bath towels or chamois leather to dry a car or it is likely to cause scratches.