Wear gloves, for safety reasons.
Fill the pan with enough warm water to cover the metal that you need to de-anodize. Add drain cleaner to the water, using 1 tablespoon for each gallon of water.
Place a fan over the pan, to get ride of any vapors that may accumulate.
Submerge the anodized metal in the water. Remove it periodically and use a soft cloth to remove smut from the surface of the metal.
Wait until the metal becomes the same uniform, flat color, then lift it out of the water and rinse it with cool water. Remove scratches by sanding it with 800 grit sandpaper.