See also:

Socket in the trunk
Lift up the cover of socket 1. ...

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 ...

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 Mercedes-Benz. ...