Plastic auto surfaces need cleaning and protection just like the rest of your vehicle. Dark plastics can fade and dry out as a result of UV exposure. Exterior trim can become covered in oils and dirt from the roadway. To keep plastics looking factory- new, use a plastic or all purpose cleaner followed by a plastic protectant with strong UV blockers. Autopia has plastic products by top car care manufacturers, such as Meguiars, Plexus, and Diamondite.