1996 GMC Savana Van Owner's Manual - Page 278

Cleaning theTop of the Instrument Panel Use only mild soap and water to clean the top surfaces of the instrument panel. Sprays containing silicones or waxes may cause annoying reflections in the windshield and even make it difficult to see through the windshield under certain conditions. Glass Glass should be cleaned often. GM Glass Cleaner (GM Part No. 1050427) or a liquid household glass cleaner will remove normal tobacco smoke and dust films. 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. If abrasive cleaners areused on the inside of the rear window, an electric defogger element may be damaged. Any temporary license should not be attached across the defogger grid. Care of Safety Belts Keep belts clean and dry. Do not bleach or dye safety belts.If you do, it may severely weaken them. In a crash, they might not be able to provide adequate protection. Clean-safetybelts only with mild soap and lukewarm water. 6-54