When rinsing brush on do you pull back slightly or just turn flow right up and leave brush totally on window, as i done loads of 3 storey town houses today and rinsed with brush on, i zig zagged down the glass but put back a bit with flow higher than i would if rinsing brush off. I only did this on top floor as seemed pointles to do on ground and 2nd, i used sl-x and single trim sl brush.
Chris