1998 GMC Sonoma Owner's Manual - Page 309

Underbody Maintenance Chemicals used for ice and 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, floor pan and exhaust system even though they have corrosion protection. At least every spring, flush thesematerials from the underbody with plain water. Clean any areas where mud and other debriscan collect. Dirt packed in closed areas of the frame should be loosened before being flushed. Your dealer oran underbody car 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 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 surfaces of new vehicles damaged by this fallout conditionwithin 12 months or 12,000 miles (20 000 km) of purchase, whichever occurs 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. 6-59