1995 Pontiac Grand Prix Owner's Manual - Page 274

Underbody Maintenance Chemical Paint Spotting Some weather and atmospheric conditions CZUI create Chemicals used for iceand snow removal and dust a chemical fallout, Airborne pollutants can fall upon control can collect on the underbody. If these are not This and attack painted surfaces on your vehicle. removed, accelerated corrosion (rust) can occur on the damage can take two forms: blotchy, ringlet-shaped underbody parts such as %el lines, frame,floor pan, and discolorations, and small irregular dark spots etched exhaust system even though they have corrosion into the paint surface. protection. At least every spring, flush these materials from the Although no defect in the paint job causes this, Pontiac underbody with plain water. Clean any areas where mud will repair, at no charge to the owner, the surfaces of and other debris can collect. Dirt packed in closed areas new vehicles damaged by this fallout condition within 12 months or 12,000miles (20 000 km) of purchase, of the frame should be loosened before being flushed. whichevercomes first. Your dealer or an underbody vehicle washing system can do this for you. Fiberglass Springs 1 NOTICE: Don't use corrosive or acidic cleaning agents, engine degreasers, aluminum cleaning agents or other harsh solvents to clean fiberglass springs; they'll damage the springs. I 6-61