Cadillac 2010 CTS Sport Sedan Owner's Manual page 410

All-wheel-drive vehicles can only be
towed with all four wheels on a
trailer.
Use only lukewarm or cold water, a
soft cloth and a car washing soap to
clean exterior lamps and lenses.
Follow instructions under Washing
the Vehicle later in this section.
Occasional waxing or mild polishing
of the vehicle by hand may be
necessary to remove residue from
the paint finish. Approved cleaning
products can be obtained from your
dealer/retailer.
If the vehicle 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.