i think i also have similar issues with my wheels. They kind of look like dripping water marks and spots. The are like greyish / whitish in color i guess. I get them all the time when i try to use wheels cleaners. I used neverdull to take it off and it worked perfectly... Take a shot at it...
http://archive.meguiarsonline.com/ga...3neverdull.jpg
they have it at autozone and other car part stores..