See also:

Restoring the factory settings
•► Press the and buttons simultaneously for approximately six seconds until the battery check lamp flashes twice. ...

Cleaning the display
– Before cleaning the display, make sure that it is switched off and has cooled down. – Clean the display surface using a commercially-available microfiber cloth and TFT/LCD display cleaner. – ...

Power washers
WARNING Do not use power washers with circular-jet nozzles (dirt grinders) to clean your vehicle, in particular the tires. You could otherwise damage the tires and cause an accident. Alway ...