this aint any help to you but thats why most trad guys dont do above connys as the window is normally to far away to get a good finish and will take about 10 mins to do the window,all you can do is tell the custy you will do the window but the finish wont be as good,you would be better off going either side of the conny and just using normal squeegee and go in straight pulls across the window,you need be charging a few extra £'s for that 1 window