I did an internet search, and couldn't find a hanging V window cleaner, but I did find this, which is remote controlled and looks expensive-http://www.ipceagle.com/products/highrise%E2%84%A2-professional-window-cleaning-system#.WAfXemczXIU
A polargraph-type machine would be cheaper, I think, and, with the architectural drawings, or good photos of a building, it could be programmed - scrub, raise mop, move, mop again. I seriously think this is worth patenting, if it hasn't been already.
I think the fans on the one I linked to could actually have applications to our Polargraphs, because I currently have to tilt my frame in order to make good pen contact from top to bottom
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