I know a guy with a brand new Mini that scrubs his car with the scrubby side of a dish washing sponge, ammonia, and paper towels. I told him he is damaging the paint, but frankly I don't really care. He is one of the most annoying people I have ever met.I'm third owner of a bone stock 04 Cobra. The worst thing I think anyone did was to scrub bugs off the bumper with a Scotch Brite pad, lol. The seller even showed it to me. I just haven't gotten around to polishing those "smudges" out of the paint.