Maintenance 137 Aluminum Unprotected aluminum surfaces will form an oxide layer if not maintained. This is especially important during the cold season when roads are salted or in coastal areas where the salt level in the air is high. Clean with steam or high pressure water. Use a mild detergent if the dirt is heavy. Rinse well. Clean aluminum surfaces with warm water. If the surface has heavy dirt or tar spots, use a tar remover. To prevent spotting, wipe aluminum surfaces dry after washing. Upholstery Clean vinyl and cloth upholstery with light brushing or vacuuming. If heavily soiled, use warm water with mild soap such as saddle or oil soap.