GMC 2007 Yukon XL Owner's Manual page 533

Notice: Machine compounding or aggressive
polishing on a basecoat/clearcoat paint
finish may damage it. Use only non-abrasive
waxes and polishes that are made for a
basecoat/clearcoat paint finish on your vehicle.
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 your 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. You can help to keep
the paint finish looking new by keeping your
vehicle garaged or covered whenever possible.
Protecting Exterior Bright Metal Parts
Bright metal parts should be cleaned regularly to
keep their luster. Washing with water is all
that is usually needed. However, you may 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.
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