Porsche Cayenne 2009 Owner's Manual page 276

Windows
The road dust which settles on the windshield and
windows contains particles of tire rubber and oil
residue. The interior trim and upholstery release
particles, particularly in strong sunlight, which col-
lect on the insides of the windows. These deposits
are augmented by impurities in the air which
enters the car through the fresh air vents.
f Clean all windows regularly, inside and outside,
with Porsche window cleaner.
f Make sure not to damage the TV antenna in the
side window when cleaning.
f If you use a chamois leather for the windows,
do not use it for paintwork as it will otherwise
pick up a certain amount of preservative or
polish and could smear the windows and thus
impair vision.
f Remove dead insects with insect remover.
276
Maintenance and Car Care
Care of wiper blades
Wiper blades that are in perfect condition are vital
for a clear view.
f Replace the wiper blades twice per year
(before and after the cold season) or if wiper
performance deteriorates or the blades are
damaged.
f For information on replacing the wiper blades:
Please see the chapter "WIPER BLADES" on
Page 263.
f Periodically clean the wiper blades with
window cleaner, especially after the vehicle
has been washed in a car wash.
We recommend the Porsche window cleaner.
In the event of heavy soiling (e.g. insect
residue), the blades can be cleaned with a
sponge or a cloth.
If the wiper blades rub or squeak, this may have
the following causes:
– If the vehicle is washed in an automatic car
wash, wax residues may adhere to the wind-
shield. These wax residues can be removed
only by using window cleaner concentrate.
f Please see the chapter "WASHER FLUID" on
Page 260.
Please contact your authorized Porsche dealer for
further information.
– The wiper blades may be damaged or worn.
f Replace damaged or worn wiper blades as
soon as possible.