1993 Buick Riviera Owner's Manual - Page 260

Minor chips and scratches can be repaired with touch-up materials availablefi-om yourdealer or other service -Theseare places where glass or metal meets rubber. outlets. Larger areas finish damage can be corrected of Silicone grease there will make them last longer, seal in your dealer's body and paint shop. better, and not squeak. Apply silicone grease with a clean cloth at least every six months. Underbody Maintenance Weatherstrips Sheet Metal Damage .If your vehicle is damaged and requires sheet metal .repair or replacement, make sure the body repair shop : applies anti-corrosion material the parts repaired or to replaced to restore corrosion protection. Chemicals used for ice and snow removal and dust on control can collect the underbody. If these are not removed, accelerated corrosion (rust) can occur on the Underbody parts such as fuel lines, frame, floor pan, and they exhaust system even though have corrosion protection. -ForeignMaterial At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud Calcium chloride and other salts, ice melting agents, and other debris can collect. Dirt packed in closed areas road oil and tar, tree sap, bird droppings, chemicals from of the frame should be loosened before being flushed. industrial chimneys, and other foreign matter can Your dealer or an underbody vehicle washing system damage your vehicle's finish if they remain on painted can do this for you. surfaces. Use cleaners that are marked safe for painted surfaces for these stains. Finish Damage Any stone chips, fractures or deep scratches the finish in should be repaired right away. Bare metal will corrode quickly and may develop into a major repair expense.