Cadillac 2010 CTS Sport Sedan Owner's Manual page 411

Foreign materials such as calcium
chloride and other salts, ice melting
agents, road oil and tar, tree sap,
bird droppings, chemicals from
industrial chimneys, etc., can
damage the vehicle's finish if they
remain on painted surfaces. Wash
the vehicle as soon as possible.
If necessary, use non-abrasive
cleaners that are marked safe for
painted surfaces to remove foreign
matter.
Exterior painted surfaces are
subject to aging, weather and
chemical fallout that can take their
toll over a period of years. To keep
the paint finish looking new, keep
the vehicle garaged or covered
whenever possible.
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.
Do not use cleaning agents that are
petroleum based or that contain
acid or abrasives, as they can
damage the paint, metal or plastic
on the vehicle. Approved cleaning
products can be obtained from
your dealer/retailer. Follow all
manufacturer directions regarding
correct product usage, necessary
safety precautions and appropriate
disposal of any vehicle care
product.