Hi, I wouldn't personally use Brasso on a my window, as it contains Amonia, and that will eventually discolour the screen, and also harden the surface, neither a good thing on a folding plastic window. In the aircraft game they use a product called 'Finnesse-it' which is by 3M, and is also widely used in body shops for putting the final finish on fresh new paint.
sorry to waffle on, but I hope this helps. Will try to post some pictures of my cars this weekend.