Anyone got any tips on how to keep your alloys looking good. It doesn't seem to matter what I use to clean them, I eventually end up with areas of ground in brake dust and grime that just can't be shifted. I'm changing my car in a few weeks time and just wondered if there is anything I can apply, while they are still new, that will keep them looking good. I thought that maybe there may be some sort of coating or something. I would also be interested on what other people find best for cleaning them.