Porsche 928 ST1991 Owner's Manual page 78

Do not use the same chamois leather for dry-
ing as you use for cleaning the windshield
and windows.
The moisture which gets on to the brakes
during a car wash can reduce braking effi-
ciency or make the brakes pull unevenly. Al-
ways apply the brakes a few times after
washing the car to test braking efficiency
and dry the brake discs.
Dust should never be wiped off the car with
a dry cloth since dust particles are abrasive
and could dull and damage the surface
finish.
Preservation
The paintwork contains certain oils which
maintain its high luster and prevent it from
becoming brittle. Climatic influences can re-
move these oils from the paintwork. This
should be counteracted by applying a paint
preservative early enough to restore the oils
preserving the high luster and preventing dirt
from settling on the surface and industrial
dust penetrating the paint.
Provided it is washed and treated with pre-
servative regularly, the brand new finish of
your car will be retained for years to come.
Apply the Porsche paint preservative after
the car wash and polish it dry to obtain a
bright finish or simply add the Porsche liquid
preservative regularly to the final rinse water
and rub down with a leather chamois.
Cleaning and preserving engine
compartment
The engine compartment and the surface of
the engine are treated with a corrosion-in-
hibitor at the factory.
If degreasing solvents are used to clean the
engine compartment or the engine is
washed down, the process almost invariably
removes the corrosion-inhibiting coating. It
is then absolutely necessary to have a dura-
ble preservative applied to all surfaces,
body seams, joints and assemblies in the en-
gine compartment. This also applies when
corrosion-inhibited parts are replaced.
Effective rust-proofing is particularly impor-
tant during the cold weather season. If your
car is driven frequently in areas where salt
has been spread on the roads, the whole en-
gine compartment should
thoroughly after the winter to prevent salt
causing any lasting damage. A full under-
body wash should also be performed at the
same time.
Windows
The road
windshield and windows contains particles
of tire rubber and oil residue. The interior trim
and upholstery release particles, particularly
in strong sunlight, which collect on the in-
sides of the windows. These deposits are au-
gmented by impurities in the air which enters
the car through the fresh air vents.
The Porsche spray-on window cleaner can
be used to clean the windows, both inside
and outside. Remember to clean the wiper
blades as well and replace them once or
twice every year, depending on condition. If
you use a chamois leather for the windows,
do not use it for the paintwork as it will other-
wise pick up a certain amount of preserva-
tive or polish and could smear the windows
and thus impair vision.
Remove dead insects with the Porsche in-
sect remover.
Polishing
Do not resort to using Porsche polish until it
be cleaned
becomes evident that the normal preserva-
tives no longer produce the desired finish.
Caution: Do not apply silicone polishes to
the windshield or windows.
dust which settles on the
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