Take them off. You can polish them yourself with rouge or send them out. Depending on severity, scratches can be removed with wetsand paper in increments beginning with 400 and finishing with 2500. Dings can be removed as well using various blocks and massaging. If you cut through the flash chrome an appearance difference will be noticed. Lose control of the piece while buffing and you can destroy it and/or injure your paw. Without the correct polisher and rouges, you cannot maximize the results easily. Depending on your objective, satisfactory results can be achieved using a regular buffer. Restored moldings have a more polished look than they were originally. The process in tedious. There was a seller on E-Bay periodically selling polished GM sets.