Hi, my wife drove a couple of smears in the rear wheel run in the parking garage. They looked white, I suppose that was the plaster or the paint of the pillars in the parking garage. My overactive father-in-law then groped about it with 600 wet sandpaper. Now the smears are in fact “smooth” and less white, but where the sandpaper is over now the paint is totally matt, like such a grey veil on it. We wanted to leave the shramms, the car is 11 Years old,,,, but now it looks even more cracked.Do I get this mat away by a paint cleaner like the Einszett Extra? And after that polish? Greetings Dirk