1996 Buick Century Owner's Manual - Page 256

Cleaning the Outsideof the Windshield, Backglass and Wiper Blades If the windshield is not clear afterusing the windshield washer, or if the wiper blade chatters when running, wax or othermaterial may be on the blade orwindshield. Clean the outside of the windshield with GM Windshield Cleaner, Bon-Ami Powder@ (GM Part No. 1050011). The windshield is clean if beads do not form when you rinse it with water. Clean the blade by wiping vigorously with a cloth soaked in full-strength windshield washer solvent. Then rinse the blade with water. Wiper blades should be checked on a regular basis and replaced when worn. Cleaning the Outside Your Buick of 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 direct raysof the sun. Don't use strong soaps orchemical detergents. Use liquid hand, dish or carwashing (mild detergent) soaps. Don't use cleaning agents that are petroleum based, or that contain acid or abrasives. All cleaning agents should be flushed'promptlyand not allowed to dry on the surface, or they could stain. Dry the finish with a soft, cleanchamois or a 100% cotton towel to avoid surface scratches and water spotting. High pressure carwashes 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 grease with a clean cloth at least every six months. During very cold, dampweather more frequent application may be required. (See "Recommended Fluids and Lubricants'' in the Index.) 6-50