<strong>Yahoo Message Number: 8994</strong>I have a 2002 Magna, and when the roof gets moisture on it, a white film of some sort flows down the side of the coach (you can tell I am a non-technical peron!). I seem to remember there is something can be done to prevent this, but I don't remember what. My guess is the roof is oxidizing, but I'm not sure if that is the problem and how to...