See also:

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

Additives
Do not use any additives in the engine oil. This could damage the engine. ...

Switching the windshield wipers on/off
WARNING   Wiper blades are components that are subject to wear and tear. Replace the wiper blades twice a year, preferably in the spring and fall. Otherwise the windows will not be wiped ...