What happens when you cross a spider and a Roomba? the answer is you get an automatic wind cleaning robot called the Windoro. This does seem somewhat practical is you are willing to take it off of one window and then place it onto another window to clean it. The Windoro also seems somewhat impractical that it can clean both sides of the window since you would have to first open the window and then put the Windoro outside of every window to clean. The only thing that i think this may be practical for is for cleaning shower glass and maybe your mirror if it is large enough. Aside from this I would not recommend this to consumers to purchase whatsoever.

Source: Gizmodo