2003 GMC Sierra 1500 Pickup Owner's Manual - Page 483

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 these materials from the underbody with plain water. Clean any areas where mud and debris can collect. Dirt packed in close areas of the frame should be loosened before being flushed. Your dealer or an underbody car washing system can do this for you. GM Vehicle Care/Appearance Materials See your GM dealer for more information on purchasing the following products. GM Vehicle Care/Appearance Materials I Description I Usage Chemical Paint Spotting Some weather and atmospheric conditions can 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 condition within 12 months or 12,000 miles (20 000 km) of purchase, whichever occurs first. 5-108 marks from whitewalls. Cleans vinyl tops, Vinyl upholstery Cleaner and convertible tops. I Glass Cleaner Removes dirt, grime, smoke and finaermints.