Hi all,
Last 2-3 days and after reading much debate on this forum re. pencil jets versus fan jets - i have been using my Vikan 11" mono brush with fan jets (blue in colour ??)
I have been using the rinsing technique now with the bristles lightly on the glass (flow control set high at

and have got it down to a fine art - it has made me about 25% faster i reckon (and i thought i was quick before )
The fan jets clearly work at their best by keeping the bristles lightly on the glass and this stops any over spray.
Have checked windows after cleaning and no spotting or complaints as yet. I think Peter Fogwill mentioned its all about having the confidence in your technique and be able to walk away from the window after rinsing without any doubts.
I am now going to fit fan jets to most of my other brush heads too.