Cadillac 2011 CTS Coupe Owner's Manual page 440

Do not clean the interior using the
following cleaners or techniques:
Never use a knife or any other
sharp object to remove a soil
from any interior surface.
Never use a stiff brush. It can
cause damage to the interior
surfaces.
Never apply heavy pressure or
rub aggressively with a cleaning
cloth. Use of heavy pressure can
damage the interior and does
not improve the effectiveness of
soil removal.
Use only mild, neutral-pH soaps.
Avoid laundry detergents or
dishwashing soaps with
degreasers. Using too much
soap will leave a residue that
leaves streaks and attracts
dirt. For liquid cleaners, about
20 drops per 3.78 L (1 gal) of
water is a good guide.
Do not heavily saturate the
upholstery while cleaning.
Do not use organic solvents
such as naptha, alcohol, etc.
Damage to the interior may
result
Use a vacuum cleaner with a soft
brush attachment to remove dust
and loose dirt. A canister vacuum
with a beater bar in the nozzle may
only be used on floor carpet and
carpeted floor mats. For soils,
always try to remove them first with
plain water or club soda. Before
cleaning, gently remove as much of
the soil as possible using one of the
following techniques:
For liquids: gently blot the
remaining soil with a paper
towel. Allow the soil to absorb
into the paper towel until no
more can be removed.
For solid dry soils: remove as
much as possible and then
vacuum.
To clean:
1. Saturate a lint-free, clean white
cloth with water or club soda.
2. Remove excess moisture.
3. Start on the outside edge of the
soil and gently rub toward the
center. Continue cleaning, using
a clean area of the cloth each
time it becomes soiled.
4. Continue to gently rub the
soiled area.
5. If the soil is not completely
removed, use a mild soap
solution and repeat the cleaning
process with plain water.
If any of the soil remains, a
commercial fabric cleaner or spot
lifter may be necessary. Test a small
hidden area for colorfastness before
using a commercial upholstery
cleaner or spot lifter. If the locally
cleaned area gives any impression
that a ring formation may result,
clean the entire surface.