I just purchased an 18yo Mercedes Benz that was very well cared for below the hood, but they let the finish go a long time ago. It has been re-painted on one side from being keyed, has a few bird dropping "slashes" that seem to be darker than the rest of the finish, and parts of the interior have become extremely sun-bleached. Help!! What do you reccommend, short of repainting and reupholstering...or are those my only options??