1993 Pontiac Trans Sport Owner's Manual - Page 263

Service & Appearance Care Fbreign Material Finish Damage Undebody Maintenance or Calcium chloride and other salts, ice Any stone chips, fractures deep scratches inthe finish should be tar, melting agents, road oil and tree sap, repaired right away. bird droppings, chemicals from industrial chimneys, and other foreign Minor chipsand scratches canbe matter can damage your vehicle's finish repaired with touch-up materials if they remain on painted surfaces. Use available from your dealer other or cleaners that are marked safe for painted service outlets. Larger areasof finish surfaces for these stains. damage can be corrected in your dealer's body and paint shop. Chemicals usedfor ice and snow removal and dust control can collect on the underbody. If these are not removed, accelerated corrosion (rust) can occur on the underbodyparts such as fuel lines, frame, floor pan, and exhaust system even thoughthey have corrosion protection. At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud and other debris can collect. Dirt packed in closed areasof the frame should be loosened before being flushed. Your dealer or an underbody vehicle washing system can do this for you.