A couple of years ago I started a thread on "another forum" about the possibility of someone making a lightweight sill brush, same sort of idea as the Vikan so you can clean the vertical pane and frame as well as the horizontal sill effectively without having to alter the angle of the brush, or move to a position where you can twist the brush to sweep the sill.
Anybody come up with one yet?
The Vikan weighs a ton, makes using a pole very hard work.
There is one called the Hi-Lo, but I think it weighs about the same.
Surely it's not beyond possibility to make one to suit requirements?