I have a area that has leaded/stained glass at top of unit and clear glass on bottom section that i currently do traditional. I have read up that a flocked brush is better for these windows. does it make to much of a difference? i have a normal Gardiner medium sill brush just now. just wanted to find out so i can order a flocked brush before the round is due again and i change over to WFP. Cheers guys.