I tried GooGone and while I was putting it on they looked great but as soon as I rubbed it back off they looked the same. Mine are dull in several places from the sun I guess. I have also tried Maguires Gold Wax and the spots that aren't dull look excellent but the sun damaged spots look the same and still remain dull. I believe the only thing to do is either replace them or paint them.
If anyone knows of anything else they think may work, please let us know!