My Acadia was bought brand new with a chip on the door, and an imperfection on the top side beam. They repainted it. Paint job was done good, but they left a lot of compound dust all over. Took it home, washed it. On the rubber molding on the top of the door, it runs along the glass, the compound has dried and looks like smear marks all along the molding. Its on the driver's door, and back passenger door. Any ideas on what might get this off, and have that black molding looking new again?