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. ...

Safety notes
WARNING Work improperly carried out on electronic components and associated software could cause them to cease functioning. Because the vehicle's electronic components are interconnected ...

Replacing the rear window wiper blade
Removing the wiper blade WARNING The wiper arm could be set in motion and injure you if the wiper is switched on. Remove the key from the ignition lock before replacing the wiper blade. - R ...