I am far too slow on the glass. I have not learnt wfp from anyone so just watched a few videos online and been doing it how I think it should be done based on lots of videos, and got quickly shown the basics in Grimsby by pure freedom. I don't rinse on the glass mainly because I have the pump on 14 and am thinking maybe this is too low to rinse on the glass?? can the low setting effect the rinsing on the glass? I have the setting low because I will get through too much water otherwise. Another thing is I go over the glass a few times this is because i'm not confident in the gardeners medium mixed dual trim brush can scrub everything off, never used a different brush so can't compare it but I understand it's a top brush. Anyway I have ordered the tecbuk hybrid with the boars hair all along the width which will hopefully have me going over the glass less but lets see. I'm currently using nearly the whole 25 litres on the trolley just to do only the front of a double fronted house with bay windows lol i read of guys on here doing 3 house with that i'm fit and i can move fast so it is my way of doing it which is wrong.