1995 Buick Riviera Owner's Manual - Page 257

Care of Safety Belts Keep belts clean and dry. Glass 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. 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 are used 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. 6-48