Ford 1998 Crown Victoria Owner's Manual page 143

Cleaning the instrument panel
Clean with a damp cloth, then dry with a dry cloth.
Avoid cleaner or polish that increases the gloss of the upper portion of
the instrument panel. The dull finish in this area helps protect the driver
from undesirable windshield reflection.
Cleaning the interior fabric
Remove dust and loose dirt with a whisk broom or a vacuum cleaner.
Remove fresh spots immediately. Do not use household or glass cleaners.
These agents can stain and discolor the fabric. Use a mild soap and
water solution if necessary.
Cleaning and maintaining the safety belts
Clean the safety belts with a mild soap solution recommended for
cleaning upholstery or carpets. Do not bleach or dye the belts, because
these actions may weaken the belt webbing.
Check the safety belt system periodically to make sure there are no
nicks, wear or cuts. If your vehicle has been involved in an accident,
refer to the Safety belt maintenance section in the Seating and safety
restraints chapter.
Underbody
Flush the complete underside of vehicle frequently. Keep body drain
holes unplugged. Inspect for road damage.
Cleaning leather seats (if equipped)
For routine cleaning, wipe the surface with a soft, damp cloth. For more
thorough cleaning, wipe the surface with a mild soap.
If the leather cannot be completely cleaned using a mild soap and water
solution, the leather may be cleaned using a commercially available
cleaning product "Tanners Preserve Leather Cleaner" and a 3M "Type T'
scrubbing pad by using the following steps;
The type of scrubbing pad is very critical because the common 3M
"Scotch Brite" green pad is too aggressive and will damage the
leather surface
Spray a small amount of the leather cleaner on the pad and rub the
area to be cleaned with the pad using a circular motion. Only clean 1/4
Maintenance and care
143