Hi fellow window cleaners! traditional and wfp alike. Ive been window cleaning for 4 years now and switched over to wfp in august. It hasn't been plain sailing all the way but then nothing ever is! The main reason I joined this forum though was to see if anyone outhere had any issues with scratching glass using wfp method? I use an Ionics double trim brush and have noticed on a few windows stratches that match the direction of brush strokes. I have a friend who has been using this brush four a couple of years and swears blind i can't be scratching it and so was I but after checking today im pretty sure I am. If you've any ideas/similar exp as to why this is happening i'd be grateful THANKS!