How to clean stains from anodized aluminum pans? I've baked some pie on my anodized aluminum pie pan but things went awry, and some dough was stuck to the pie in the end; I assume it was overbaked?
I could remove the pieces but stains were left behind.
Here are pictures:






  Are these stains a big deal? Do they mean the pan or anodization has been damaged? What can cause them, or how to avoid them?


I've looked around on how to clean and remove these stains, but have found contradictory advice on using baking soda, or other methods.


  Is it possible to remove these stains, and if so, how?
This looks like you are starting to getting a layer of polymerized oil on the pan, like the seasoning on a cast iron pan. 

I wouldn't try removing it. The usual methods are either using a strong base (which works really well) or mechanical forms of removal, which are less effective. But the strong base will corrode your pan, and the mechanical removal will scratch and damage the anodized layer. 

You can try the baking soda, but it is so weak a base that it is unlikely to have much of an effect. 

I would just continue to use the pan as it is.