If they are the newer flat leaded windows, then soap up as normal with your strip washer and squeegee off using straight pulls, polish out before dry with your scrim. Depending on how dirty they get you may only have to do this at first, on the following cleans just wash over with a damp no 2 scrim and polish out with a dry no 1 scrim. On the older individual leaded panes that are not flat enough to squeegee just use the second method. A rat tailed mop can work better than a no 2 scrim if you like them.
But by far the easiest method is waterfed pole, just scrub, rinse and allow to dry. Wonderful!!!