Anyone know how intricate it is to replace the brushes on the drivers side window. When the window is coming up, the brushes are not clearing it. Thought they maybe worn or damaged.

cheers.

I did replace window seals but had to remove door card and loosen the wing mirror.

 

But you can put a 10mm wide and 2mm-4mm thick strip of adhesive closed cell neoprene foam tape on the outside in the seal,  behind the brushes, to press them towards the window. The strip is not visible unless you look very closely, and might provide enough pressure to clean the window fully. 

 

The driver side window was smashed during a break-in under previous owner of my vRS, and no matter how much you straighten the metal parts afterwards, the window would not seal fully at high speeds until I put that extra neoprene foam tape (on top of a new set of seals).  Until then I had extra wind noise above ~110mph, quite annoying on autobahn trips.