The wheel bolts on my Cayman were starting to look a bit shabby, starting to get a bit rusty on the heads. I've heard that this is a common problem. I removed them, pushed off the floating alloy washer and took them to a local metal finishers. They cleaned them in some kind of acid bath that removes the rust and original poor plating, then they re-plated them in bright zinc and clear passivated finish and all for £10. Result...looks like new! Perfect.
Martin
Martin