1998 GMC Sonoma Owner's Manual - Page 305

Care of SafetyBelts Keep belts clean and dry. 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 material may be on the blade or windshield. Do not bleach or dye safety belts. If you do, it a may severely weaken them. In crash, they might not beable to provide adequate protection. Clean safety belts only with mild soap and lukewarm water. Clean the outside of the windshield with GM Windshield Cleaner, Bon Ami@Powder (non-scratching glass cleaning powder), GM P r No. 1050011. The at 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 blade by 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 Glass Surfaces Glass should be cleaned often. GM Glass Cleaner (GM P r No. 1050427) or a liquid household glass cleaner at will remove normal tobacco smoke and dust films on interior glass. Don't use abrasive cleaners on glass, because they may cause scratches. Avoid placing decals on the inside rear window, since they may have to be scraped off later. 6-55