I've noticed I always get really bad results when cleaning my own house windows, particularly when the low sun is shinning on them, so I've started trading the bottom windows and found them slightly better than water fed pole but still not perfect. Also they definitely get dirty again faster when cleaned by trad. I cleaned them week ago and looking at them now they are filthy!
I've come the the conclusion that it must be due to the age of the windows and the hammering of the weather on them over the years means they will never have a perfect finish.
