See also:

Screw thread
Push out the cover by pressing on the top edge. ...

Switching on the rear window wiper
Press the lever forward: intermittent wipe. When reverse gear is engaged, the system switches to continuous operation. To clean the rear window, press the lever further forward. ...

BMW Maintenance System
The maintenance system directs you to required maintenance measures and thereby supports you in maintaining road safety and the operational reliability of the vehicle. ...