New Roomba-like household robots are popping every day, now. The Windoro consists of two scrubbing modules, one on each side of the glass, held together with magnets:

The robot uses distance sensors, attitude adjustment, and obstacle detection while doing its little window waltz, employing detergent and a series of spinning pads to wash up as it goes.

This robot was developed by the Pohang Institute of Intelligent Robotics in South Korea. You can watch a video of the robot in action at the link.

Link via DVICE | Photo: DVICE