Let me get this straight Wayne. You lift the brush off the frame, and rinse just the top and side seals? Or do you rinse the frame with the brush off as well? Or just wash it when your washing the frame?
How would this work with wooden windows that have no seals? What do you do then? I'm finding it an immense struggle to clean these, even if I don't touch the top frame when rinsing, it always seems to leach on to the glass. 
I wash any and all types of windows with the exception of 'milky windows' with my brush 'on' the glass for both scrubbing and rinsing regardless of whatever height I'm cleaning.
When it comes to 'milky white haze ' windows: I scrub the frames and glass with brush 'on' to loosen the dirt. Then I lift my brush just slightly away from the window to rinse 'just the top frame and both sides where the edging seals are (about 12 inches in from the seal into the glass pane itself).
It's important not to let the brush bristles touch the frame when rinsing 'off' as that is what agitates the paint.
Rinsing water (brush off) around the perimeter of the seal just brings down the dirty water, not the paint.
To finish the window, I put my brush back on the glass and rinse 4 inches inset from the frame near the top and work my way back to the bottom and lift away near the bottom seal. Cleaning this way minimises problems associated with 'milky white haze' IMO.
Hope you understood what I'm babbling on about
