1995 Chevrolet S10 Pickup Owner's Manual - Page 272

Underbody Maintenance Chemicals used for iceand snow removal and dust controlcan collect on the underbody. If these are not removed, accelerated corrosion (rust) can occur on the underbody parts such as fuel lines, frame, floor pan, and exhaust systemeven though they have corrosionprotection. At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud and other debris cancollect. Dirt packed in closed areasof the frameshould 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 chemicalfallout. Airborne pollutants can fall upon and attack painted surfaces on your vehicle. This damage can take two forms: blotchy, ringlet-shaped discolorations, and small irregular dark spots etched into the paint surface. Although no defect in the paint job causes this, GM will repair, at no charge to the owner, the surfacesof new vehicles damaged by this fallout condition (20 within 12 months or 12,000 miles 000 km) of purchase, whichever comes first. This applies only to materials manufactured and sold by General Motors. Bodies, body conversions or equipment not made or sold by General Motors are not covered. 6-55