Not really fussed to be honest, just fancied getting them looking nice for FCS. I had a go at them today and got nowhere! LIiterally, couldn't even get the nuts off with a breaker bar included!
I used Autoglym wheel cleaner stuff which is pretty damn strong, but didn't budge the stuff in the corners, and I even destroyed my wheel brush to use some of the 'pad' to get right into the corners, no luck. Clay doesn't do anything either.
I'll probably get them refurbed in the summer, as they're not in the best nick, so I'll leave them til then...