I really don't drive my XLR very much, but recently there has been a "chalky" film on some the the interior leather. Now I keep the car in a dehumidified and keep the air circulating in the garage. In the trunk and interior I keep descant bags. I'm at a loss about this stuff. When I first purchased the XLR I had a spot on the dash board that I cleaned up with Murphy's Oil Soap, I think. Is this a standard issue or what?