I used Magic Eraser with very good results. I do have one mark that I can't remove. I don't know how it got there. It looks like a mark that aluminum makes. It's grey. I do have Goo Gone Do I'll try it someplace you can't see in it's normal position, just in case.

After cleaning it am I supposed to put on a protective coating or does that do more home than good? I don't want to make it shiney either, if possible.
thank-you all