Buick REGAL 2011 Owner's Manual page 318

Bright metal parts should be
cleaned regularly to keep their
luster. Wash with water or use
chrome polish on chrome or
stainless steel trim, if necessary.
Use special care with aluminum
trim. To avoid damaging protective
trim, never use auto or chrome
polish, steam, or caustic soap
to clean aluminum. A coating of
wax, rubbed to high polish, is
recommended for all bright metal
parts.
To preserve the vehicle's finish,
keep it clean by washing it often.
Do not wash the vehicle in direct
sunlight and use a car
washing soap.
Rinse the vehicle well, before
washing and after, to remove all
cleaning agents completely. If they
are allowed to dry on the surface,
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 could
cause water to enter the vehicle.
Avoid using high pressure washes
closer than 30 cm (12 in) to the
surface of the vehicle. Use of power
washers exceeding 8,274 kPa
(1,200 psi) can result in damage or
removal of paint and decals.
Silicone grease on weatherstrips will
make them last longer, seal better,
and not stick or squeak. Apply
silicone grease with a clean cloth.
During very cold, damp weather
frequent application may be
required. See
.