1997 GMC Sonoma Owner's Manual - Page 295

Cleaning the Outsideof the Windshield and Wiper Blades If the windshield is not clear after using the windshield washer, or if the wiper blade chatters when running, wax, sap or other materialmay be on the bladeor windshield. Clean the outside of the windshield with GM Windshield Cleaner, Bon Ami@ Powder (non-scratching glass cleaning powder), GM Part No. 1050011. The windshield is clean if beads do not form when you rinse it with water. Grime from the windshield will stick to the wiper blades and affect their performance. Clean the bladeby wiping vigorously with a cloth soaked in full-strength windshield washer solvent. Then rinse the blade with water. Check the wiper blades and clean them as necessary; replace blades that look worn. Cleaning the Outsideof Your Vehicle The paint finish on your vehicle provides beauty, depth of color, gloss retention and durability. Washing Your Vehicle The best way to preserve your vehicle's finish is to keep it clean by washing it often with lukewarm or cold water. Don't wash your vehicle in the directrays of the sun. Don't use strong soaps orchemical detergents. Use liquid hand, dish or car washing (mild detergent)soaps. Don't use cleaning agents that are petroleum based, or that contain acid or abrasives.All cleaning agents should be flushed promptly and not allowed to dry on the surface, or they could stain. Dry the finish with a soft, cleanchamois or an all-cotton towel to avoid surface scratchesand water spotting. High pressure car washes may cause water to enter your vehicle. Weatherstrips Silicone greaseon weatherstrips will make them last longer, seal better, and not stick or squeak.Apply silicone greasewith a clean clothat least every six months. During very cold, damp weather more frequent application may be required. (See "Recommended Fluids and Lubricants" in the Index.) Cleaning Exterior Lamps/Lenses Use lukewarm or cold water,a soft cloth and a liquid hand, dish or car washing (mild detergent) soap to clean exterior lamps and lenses. Follow instructions under "Washing Your Vehicle." 6-57