Ecovacs has launched the Winbot W1 Pro window cleaning robot in Europe. The device clings to the surface of the window using 2,800 Pa of suction, with an optional safety rope for outdoor use. The gadget can clean an area up to 20 m² (~215 ft²) with 30 minutes of battery life, and the robot will alert you when the water tank needs refilling.
https://www.notebookcheck.net/Ecovacs-Winbot-W1-Pro-window-cleaning-robot-launches.619899.0.html