Mercedes-Benz M-Class 2014 Owners Manual - Manual (Page 377)

The ball coupling must be cleaned if it
becomes dirty or corroded.
X Remove rust on the ball of the ball coupling,
e.g. with a wire brush.
X Remove dirt with a clean, lint-free cloth or
a brush.
X After cleaning, lightly oil or grease ball
coupling :.
X
Check that the vehicle's trailer tow hitch is
working properly.
i You can also have the maintenance work
on the ball coupling and the trailer tow hitch
carried out by a qualified specialist
workshop.
Interior care
Cleaning the display
!
For cleaning, do not use any of the
following:
R alcohol-based thinner or gasoline
R abrasive cleaning agents
R commercially-available household
cleaning agents
These may damage the display surface. Do
not put pressure on the display surface
when cleaning. This could lead to
irreparable damage to the display.
X Before cleaning the display, make sure that
it is switched off and has cooled down.
X
Clean the display surface using a
commercially available microfiber cloth
and TFT/LCD display cleaner.
X Dry the display surface using a dry
microfiber cloth.
Cleaning Night View Assist Plus
!
Never clean the camera lens. When
cleaning the field of vision of the driving
systems, make sure that you do not spray
glass cleaner on the camera lens. If the
camera lens is dirty, visit a qualified
specialist workshop.
X
Fold down the camera cover by recess :.
X Use a soft cloth to clean the windshield in
front of camera ;.
Care
375
Maintenance
and
care
Z