I used to wash windows for a living and daydreamed about automating the task. But this particular solution seems a lot more trouble than its worth. The thing can't move from window to window without having a person on both sides of the window. Not to mention that it takes forever.

I envision something with suction cups, a squeegee and maybe a safety line.

My windows are at ground level, but I really hate buying apples at the market and then having to wash them. Time for...

Roomba for Macintosh