Hi Tom,
On upstairs windows i always use a mono brush as i always rinse on whenever possible,for upstairs i use a salmon mono brush which can be got from Peter Fogwill.The 9" one that i use at the moment can`t be got anymore as they have discotinued it,a lot of mono brushes feel fine when used on ground floor window`s but when using it on tops it`s just flops on the glass as it`s to soft.Peter will supply you with a 11" fanned or jetted brush which will do the job,the thing is with Peter is that he is a big big fan of rinsing on as i am therefore you`ll get the right brush for the job as he uses them daily as i do,when rinsing on the glass the key is to use a slightly higher flow rate and once mastered you`ll wonder how or why you ever rinsed off.The ones your hearing saying rinse off for perfect results are either using the wrong brush or not using enough water.