Originally Posted by jur
Simple. Soak in sodium hydroxide - it dissolves anodising. Important to experiment how long. You're on your own.
It sure will. It will also dissolve the underlying aluminum. Bad idea. The oven cleaner recommendation is based (pun unintended) on the same chemistry. Most oven cleaners contain sodium hydroxide (aka lye)
BTW, anodizing is actually a very thin layer of aluminum oxide formed electrically on the surface. It is not a coating and is not an "acid etch". It's removal will allow the Al to discolor and dull with time so be sure to ptrotect it if you remove the anodizing chemically or mechanically.