Originally Posted by vision.dynamix
Its a steel insert. Steel rusts.
You can try to shoot it with Clear, but the lug will just wear away the clear anyway.
I may give that a shot. There must have been something on there from the factory as they did not rust for the first few years. They look fine in the pic's above as I had just cleaned them the day before. When the inserts are fully rusted the wheels look pretty bad.