Used to do all upstairs windows(houses) with a pole from the US many years ago, cant remeber the name of the darn thing now, but used to have a curve at the business end, which enabled you with practice to squeegee the glass quite well, had to be careful when soaping up the glass not to go right to the top or touch frame, or else you would spend an age trying to get rid of runs and drips, think it may have been called the pro curve, we got them from J Racenstein i think!!
Regards,
Rob