the water in itself is a great cleaning agent, scrub and rince all the frames especially rince the top frame, go quickly over the glass do this for all the windows, dont bother rinceing the glass, just the top couple of inches, then start again at the first window, the water will have soaked in and made cleaning really easy, scrub the window missing the top 2 or so inches of the glass (for first time drips) and then rince (two inches from the top) turn the water off and scrub the sill clean (do this a couple of times) by doing it this way you dont need to be rinsing anything out of the brush etc, takes a long time, but you will be getting then 100% the next time will be really easy on you