Read Peters post and am unsure!
When Ionics came and did a demo the guy rinsed with brush on the glass. OK it was a first clean, but when I returned when dry and the "SALESPERSON" gone there were what seemed to me "Brush marks and dots". Surely a rinse off the glass would alleviate this.
I do use Ionics brushes, also a Vikan as a spare(not used), and am on my first cleans, rinsing with brush off the glass, maybe this is essential for first few cleans, then on fourth or fifth clean rinse with brush on glass!
Comments please, as it is a bind rinsing this way, done 1st clean on 3 storey house today, hard work!