See also:

Activating/deactivating the MONO function
This function is only available in vehicles for Canada. You can use the MONO function to adopt the temperature and air distribution settings on the driver's side for the front-passenger side. ...

Cleaning genuine wood and trim elements
  Wipe the wooden trim and trim pieces with a damp, lint-free cloth, e.g. a microfiber cloth.   Heavy soiling: use car care and cleaning products recommended and approved by Mercede ...

Problems with the SmartKey
Problem Possible causes/consequences and Solutions You cannot lock or unlock the vehicle using the SmartKey. The SmartKey battery is discharged or nearly discharged. - ...