some clever bugger designed and produced a fully lecy pole.
been thinking if you put one of them little motors( but scaled slightly bigger) that they have in a lecy tooth brush, or even 4 side by side to fill out a 12 inch brush so you've got 4 rotating circular brushes all next to each other that cover roughly the same area as a standard brush.
l cant imagine how a pole would extend electrically but l imagine those new hoses that the old people have in their garden, the ones that extend with water pressure then retract when the pressure goes off. if that were adapted somehow it could pssobly work inside a pole, some kind of concertina system ! would take a lot of trial and error etc but l reckon some clever bugger could do it. even the gooseneck could be angled electrically.
l can just see us all wearing little backpacks with battery's in to power the pole, just point the pole and push a button and it would rise to the window and the sensor would say when to stop. then just line the brush up with the glass and let it do the work.
reckon it would be heavy though, reckon it would take a lot of research and development, reckon it would be expensive, but l reckon it could be done by some clever bugger.