1998 Buick Riviera Owner's Manual - Page 293

Cleaning Exterior LampsLenses Use lukewarm or cold water, a soft cloth and a liquid hand, dish or car washing (mild detergent) soap to clean exterior lamps and lenses. Follow instructions under "Washing Your Vehicle." I NOTICE: Machine compounding or aggressive polishing on a basecoatklearcoat paint finish may dull the finish or leave swirl marks. Finish Care Occasional waxing or mild polishingyour vehicle by of Foreign materials suchas calcium chloride and other hand may be necessary to remove residue from the paintsalts, ice melting agents, road oil and tar, tree sap, bird finish. You can get GM-approved cleaning products droppings, chemicals from industrial chimneys, etc., can from your dealer. (See "Appearance Care and Materials" damage your vehicle's finish they remain on painted if in the Index.) surfaces. Wash the vehicle as soon as possible. If necessary, use non-abrasive cleaners that are marked Your Buick has a "basecoat/clearcoat" paint finish. safe for painted surfaces to remove foreign matter. The clearcoat gives more depth and gloss to the colored basecoat. Always use waxes' and polishes Exterior painted surfaces are subject to aging, weather that are non-abrasive and made a basecoatlclearcoat for and chemical fallout that can take their toll over a period D finish. a of years. You can help to keep paint finish looking the new by keeping your vehicle garaged or covered whenever possible.