See also:

Resetting to factory settings
For safety reasons, the Day Lights function in the Lights submenu is only reset when the vehicle is stationary. •► Press the button on the steering wheel to select the Settings menu. ...

The windshield wipers are inoperative
The windshield wiper drive is malfunctioning. - Select another wiper speed on the combination switch. - Have the windshield wipers checked at a qualified specialist workshop. ...

Cleaning the headliner and carpets
  Headliner: use a soft brush or a cleaning agent recommended and approved by Mercedes-Benz to remove heavy soiling.   Carpets: use the carpet and textile cleaning agents recommended ...