1993 Pontiac Grand Prix Owner's Manual - Page 268

Sheet Metal Damage If your vehicleis damaged and requires sheet metal repairor replacement, make sure the body repair shop applies anticorrosion materialto theparts repaired or replaced to restore corrosion protection. Finish Damage Any stone chips, fractures or deep scratches in the finish should be repaired right away. Bare metal will corrode quicklyand may developinto a major repair expense. Minor chips and scratches can be repaired with touch-up materials available from your dealer orother service outlets. Larger areas of finish damage can be corrected in your dealer's bodyand paint shop. Underbody Maintenance Chemicals used for ice snow and removal and dust control can collect on the underbody. If these are not removed, accelerated corrosion (rust) can occur on theunderbody parts such as fuel lines, frame, floorpan, and exhaust system eventhough they have corrosion protection. At least every spring,flush these materials from the underbody with plain water. Clean anyareas where mud and other debris can collect. Dirt packed in closed areas of the frame should be loosened before being flushed. Your dealer oran underbody vehicle washing system can do this for you. Foreign Material Calcium chlorideand other salts, ice melting agents, road oil tar, tree and sap, bird droppings, chemicals from industrial chimneys,and other foreign matter can damage your vehicle's finish if they remainon painted surfaces. Use cleaners that are marked safe for painted surfaces forthese stains.