Got my 2nd cleans coming up with wfp, so I though I would do my mums first which it did 5 weeks ago. They are newish upvc and they had a good clean last time, tops of the frame ect. I did they today gave the top of the frame a quick brush did the rest of the frames then all the glass and rinsed all the glass last, but there were a few small run marks coming from the tops of the glass, could anyone give me some advice on how to eliminate this or if I'm doing something wrong