XF, apart from getting them polished as above, (which would clean up the faded clear coat), would be to then get a spray painter mate to paint the spokes black. Then you'd need to sit down and carefully clean the outside face of the spokes with some paint thinners. You'd probably then have to hand polish them to match the actual rim surface. I'm presuming you have the 'Ghia' spec snowflakes. After that, then get your spray painter mate to do the lot in clear coat, or just polish them up on a regular basis. My cousin reconditioned a set of hot wires for me a number of years ago. Took a lot of work, but it was worth it. Oh, he was a spray painter by the way....
Original XD 351 Ute - I got one!!
HSV - I just don't want one....EVER!
My XF 3 on the tree ute is ALWAYS stuck in third......