Hi mate and welcome from the X5 division :-) I have the same problem with mine I have tried a couple of cleaning products on mine and although they are cleaner there not as I want them . You can replace just the ally part but to buy new there a fortune There was a set on eBay that looked nice but pick up only too far from me Let me know how you get on and if I see a set or find a cleaner that works I in box you The running board are next on my list when I get back from my holiday on Saturday