Have used four different brushes so far and without a doubt in my mind the flocked sill brush is my favourite, These are how I rate them. 1. The flocked sill to me this brush as a large cleaning area the radius design gets into all the crooks and crannies for a good clean. 2. Super lite Medium mix quite a good brush feels more sturdy slightly more cleaning area due to the bristles being slightly longer than the ultimate flock. 3. Ultimate flock used this a couple of times now, I'm not liking as much as the flocked sill seems to take longer to clean than the sill brush maybe it's just me. 4. Cladding brush this is a small flocked brush duel trim havn't used much small trial own Windows. got a small conny roof due next week so getting tested then. I know it's been covered before but for me the flocked sill is my go to brush what's your go to brush and why.