Stop wasting time cleaning windows with cloths and Windex and try the Ecovac Winbot. This Roomba-looking robot will clean your windows while you sit back and relax.
The Ecovac Winbot works using magnets. There are actually two parts to the robot, one that goes on the outside and one that goes on the inside. Their magnets cling together as they dance across the window until it's sparkling. Two people are required to place the robots on either side of the window, so while this handy device may be useful for household windows, it may not be ideal for windows on the 80th floor of an office building.
Nonetheless this square robot can be yours for only $399. If you can't afford that go buy some Windex.