1994 GMC Suburban Owner's Manual - Page 322

Weatherstrips Silicone greaseon weatherstrips will make them last longer, seal better, and not stick or squeak. Apply silicone greasewith a clean cloth at least every six months. During very cold, damp weather more frequent application may be required. (See "Recommended Fluids & Lubricants" in the Index.) 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 to the parts repaired or replaced to restore corrosion protection. Foreign Material Calcium chloride and other salts, ice melting agents, road oil and tar, tree sap, bird droppings, chemicalsfrom industrial chimneys, and other foreign matter can damage your vehicle's finish if they remain on painted surfaces. Use cleaners that are marked safe forpainted surfaces to remove foreign matter. Finish Damage Any stone chips,fractures or deep scratches in the finish should be repaired right away. Bare metal will corrode quickly and may develop into a major repair expense. Minor chips and scratches can be repaired with touch-up materials available from your dealer or other service outlets. Larger areas of finish damage can be corrected in your dealer's body and paint shop. Underbody Maintenance Chemicals used for iceand snow removal and dust control can collect on the underbody. If these are not removed, accelerated corrosion (rust) can occur on the underbody parts such as fuel lines, frame, floorpan, and exhaust system even though they have corrosion protection. At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud and other debriscan collect. Dirt packed in closed areasof the frame should be loosened before being flushed. Your dealer oran underbody vehicle washing system can do this for you. Chemical Paint Spotting Some weather and atmospheric conditionscan create a chemical fallout. Airborne pollutants can fall upon and attack painted surfaces on your vehicle. This damage can t.ake two forms: blotchy, ringlet-shaped discolorations, and small irregular dark spots etched into the paint surface. 6-76