98 Purple TA

I have the original chrome rims on my TA and have noticed that they are covered in a lacey rust film that will not come off. In the areas where the 5 star spokes meet the outer rim, a discoloration can be seen and felt. on the rest of the rim, it is only noticable when light is show directly on the rim. I have tried to use a few metal compounds to remove the stuff with no luck. The metal surfaces (except where mentioned above) feels smooth without any pits or bumps. This vehicle is a garage queen and only sees sunny days so it is not from road salt or other winter time issues.

Please do not respond to this thread about changing out my rims.