Porsche 92854 Owner's Manual page 128

The acid free cleaning solution must not have a pH value greater
than 10 (see explanation), in case of doubt, it is recommended to
check with the manufacturer of that particular cleaner.
Every three months (after regular cleaning) the wheels should be
coated with petroleum jelly. R u b it in firmly with a s o f t cloth. N e v e r
use abrasive or metal polishing cleaning agents.
Explanation of pH value
T h e pH v a l u e is a m e a s u r e m e n t for the hydrogen-ion concentration
in a liquid. T h i s v a l u e tells if the liquid reaction is s o u r ( a c i d ) or alkal-
ine (lye solution).
At a pH v a l u e of 7, the reaction of the liquid is neutral ( t h a t is, chemi-
cally clean water), i t i s n o t a n acid o r alkaline. Acids h a v e a p H v a l u e
u n d e r 7, the strength of the acide increases with a l o w e r pH v a l u e .
Alkaline lies between a pH value of 7 and 1 4 , the strength of the al-
kaline increases with higher pH values.
For example: a mineral water mixed with carbon dioxide has a pH
value of 6-6.5, reaction is also light sour. Battery acid in compari-
son has a pH value of 1.
or
the pH v a l u e for n o r m a l soap solution is 8 - 9 , b u t the s o a p solution
for a dishwasher is approximately 12.5, this would not be suitable
for wheel cleaning.
Your Porsche dealer can advise you which product to use.
Remember that moisture and road salt on brakes may affect
braking efficiency. Test the brakes after each car or wheel wash.
12
Interior
Glass
U s e the s a m e cleaning a g e n t s a s f o r t h e exterior and polish dry with
a soft cloth or paper towel.
Fabric
Use a vacuum cleaner or a soft bristle brush to remove dust and
loose dirt from carpeting, upholstery, headliner and other trim. D i r t
stains can usually be removed with lukewarm soap water or an all
purpose cleaner solution, or a dry foam cleaner. For greasy, oily
and other stubborn stains, u s e a spot r e m o v e r . Do n o t pour the l i -
quid on the fabric. D a m p e n a clean cloth and rub carefully, starting
at the edge and working inward.
Safety belts
Keep belts clean. Very dirty belts may not retract properly. Do not
remove belts from the vehicle to be cleaned. Do n o t u s e chemical
cleaning agents, bleach or dyes. T h e y contain corrosive proper-
ties which will weaken the webbing. Do not allow inertia reel safe-
ty belts to retract before they are completely dry.
F o r cleaning, u s e a mild s o a p w a t e r solution. L e t belts dry out tho-
rougly and away from direct sun light.
Plastic, vinyl and leatherette
U s e a clean, d a m p cloth or sponge to k e e p this trim free from dust.
F o r other soilage, u s e a l u k e w a r m all purpose cleaning solution or a