How to Remove "Water Stains" from Fuchs Wheels?

[wrxnofx]

I am finally at the point of being able to think about detailing aspects of my '87 Coupe that I picked up last summer. Here is a pic of one of my wheels:


I cannot get this "staining" off the silver part of the wheel. I've tried rubbing compound, metal polish, scotch brite pads, and none of it touches it.

Is the anodizing etched? Is it ruined, or does someone have a suggestion of how to get these spots off?

It seems this forum is seldom posted to, so hopefully I can get some feedback.