Window & Door Track Cleaning Brush 4 "More than one use" Mrs Barnard 15 April 2015 We bought this to clean window tracks - and it does that well, apart from the corners. It even cleans moss from the brush seals (yes, they've not been cleaned since the windows were fitted!). However, I also discovered it's excellent for dealing with the mould that grows on the silicone on the inside of the trims, etc. AND - here's a novel use - it cleans the grooves in matchboarding, that Victorian cladding with grooves that attract mould during the winter. I suspect it would also work in modern T & G cladding.