Good clip there,you can phisically see that the brush is slowing you down in that clip.The problem your having there in the video is the reason why i hate those brushes,you don`t ever feel that it`s cleaned anything.I like to use a brush that i know i only have to get it on the glass and it will clean it it`s more a case of rinsing rather than scrubbing,you can see with that brush your having to scrub far to much.