Buick 1994 Roadmaster Owner's Manual page 270

Cleaning the Outside of Your Buick
The paint finish on your vehicle provides beauty, depth
of color, gloss retention and durability.
Washing Your Vehicle
The best way to preserve your vehicle's finish is to keep
it clean by washing it often with lukewatm 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.
Don't use cleaning agents 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 a 100% 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 Buick 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 Buick has 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.
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NOTICE:
Machine compounding or aggressive polishing
on a basecoatlclearcoat paint finish .may dull the
finish or leave swirl marks.