You might have heard lots of people moaning about brush lines being left on first cleans and having to go over them again,a flocked brush on first cleans or really dirty regular cleans will clean them a lot quicker and better initially without the need to scrub and scrub with a mono on a first clean.A flocked brush also works better on downstairs windows i find over the superlite brush,the superlite brush is superb on tops but i find it`s to flimsy for downs and tends to fold on itself a bit to much.