pull ur hose the furtherest away point and work back to van
on first cleans, clean the tops of the windows first on all the windows then go back and clean rest of windows, this iwll make life easier in the long run, it might take u a bit longer on the first cleans but it is worth it, (i am now at the point after 4-5 clean on some houses, that when i get there i have to check it has been a month a sthey are still pretty clean)
u will be suprised how many dont care how u clean the windows, as long as they are clean, i am starting to wear a hiviz jacket and have a sign that says wc in progress, so if any one says anything just say health and safety and they leave you alone lol