Hello, I drive a C240 in black metallic! I had stains on the paint in the form of small dark knobs, maybe it was bat out. I got this knob away by polishing these places with paint cleaners. Now I have the problem that at these places the paint has become lighter, so it is noticeable! Then I polished the whole car with paint cleaner and sealed it, but the bright spots have remained! Also Colorwachs has nothing Does anyone have an idea what else I can try? Greetings Dieter