Cleaning unit, scraper unit, optical sensing device and method for cleaning

A cleaning unit for cleaning a sensor window pane of an optical sensing device of a motor vehicle, said cleaning unit comprising:

• a wiper blade;
• at least a first scraper for scraping impediments off the wiper blade;
• and
• a wipe off surface, wherein:
• the cleaning unit is arranged for wiping the wiper blade over the sensor window pane,
• the cleaning unit is arranged for moving the wiper blade with respect to and along the first scraper and/or moving the first scraper with respect to and along the wiper blade for scraping impediments off the wiper blade, and
• the cleaning unit is arranged for allowing the wiper blade to sweep over the wipe off surface, wherein the wipe off surface is spaced apart from a first scraper edge defined by the first scraper, so as to form an outlet channel.