Many years ago, I noticed scratches on my car's hood. It turns out that the neighbor's cat would climb and it, and when startled by one us, opening the door, the cat would scramble off the hood, trying to get traction with its nails.
There are at least a couple of ways washing a vehicle can cause scratches.
1. If your bucket does not have a dirt strainer, granules of sand can become trapped in a microfiber towel, and subsequently result in scratched in the paint's clear coat.
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2. Insufficient car wash suds: