1998 Chevrolet Express Van Owner's Manual - Page 294

Cleaning the Outside Your Vehicle of The paint finish on your vehicle provides beauty, depth of color, gloss retention and durability. Cleaning Exterior LampsLenses Use lukewarm or cold water, a soft cloth and a liquid hand, dish or carwashing (mild detergent) soap to clean exterior lamps and lenses. Follow instructions under "Washing Your Vehicle." 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 rays of the sun. Don't use strong soaps or chemical detergents. Use liquid hand, dish or car washing (mild detergent) soaps. You can get GM-approved cleaning products from your dealer. (See "Appearance Care and Materials" in the Index.) Don't use cleaning agents that are petroleum based, or that contain acid or abrasives. All cleaning agents should be flushed promptly and not allowed to dry on the surface, or they could stain. Dry the finish with a soft, clean chamois or an all-cotton towel to avoid surface scratches and water spotting. High pressure car washes may cause water to enter your vehicle. Finish Care Occasional waxing or mild polishing of your vehicle by hand 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 "basecoatklearcoat" 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 basecoatklearcoat paint finish. I I NOTICE: Machine compounding or aggressive polishing on a basecoatklearcoat paint finish may dull the finish or leave swirl marks. I