I know I will be shot down or ignored, but
I use a mixture of washing up liquid/white vinegar and pure water (ratio 1,1,2)
and I use it on all bottom window sills and glass if really dirty.
(I even use it on bird muck on top windows, one spray on brush head)
Speeds work up on end.
I use this in a spray, and I have never, yes never left a "Residue" or "Grey Streaks" on any windows!
Wait for the insults and "what's the point of that" comments, not to mention the "We are trying to get away from using chemicals" comments
(well if this forum is the same as it was 1-2 years ago, it will)