1994 GMC Suburban Owner's Manual - Page 321

Finish Care Occasional waxing or mild polishing of your vehicle may be necessary to remove residue from the paint finish. You can get GM approved cleaning products from your dealer. (See "Appearance Care and Materials" in the Index .) Your vehicle may have a "basecoat/clearcoat"paint finish. The clearcoat gives more depth and gloss to the colored basecoat. Always use waxes and polishes that are non-abrasive and made for a basecoat/clearcoat paint finish. NOTICE: Machine compounding or aggressive polishing on a basecoatlclearcoat paint finish may dull the finish or leave swirl marks. Protecting Exterior Bright Metal Parts Bright metal parts should be cleaned regularly to keep their luster. Washing with water is all that is usually needed. However, you may use GM Chrome Polish on chrome or stainlesssteel trim, if necessary. Use special care with aluminum trim. To avoid damaging protective trim, never use auto or chromepolish, steam or caustic soapto clean aluminum. A coating of wax, rubbed to high polish, is recommended for all bright metal parts. Aluminum Wheels (If So Equipped) Your aluminum wheels have a protective coating similar to painted the surface of your vehicle. Don't use strong soaps, chemicals, chrome polish, abrasive cleaners or abrasive cleaning brushes on them because you could damage this coating. After rinsing thoroughly, a wax may be applied. NOTICE: If you have aluminum wheels, don't use an automatic vehicle wash that has hard silicon carbide cleaning brushes. These brushes can takeoff the protective coating. White Sidewa/l Tires Your GM dealer has a GM White Sidewall TireCleaner. You can use a stiff brush with the cleaner. 6-75