See also:

Cleaning the steering wheel and gear or selector lever
Thoroughly wipe with a damp cloth or use leather care agents that have been recommended and approved by Mercedes- Benz. ...

General notes
If you cannot lock or unlock the vehicle with the SmartKey, either the battery in the SmartKey is discharged, the SmartKey is faulty or the starter battery is discharged. - Check the battery in ...

Cup holder in the front-compartmentcenter console
In the front part of the center console, there is a cup holder and a removable support with a card holder. You can remove the cup holder to clean it. Clean with clear, lukewarm water only. ...