Do not use drain cleaner. Buy anodizing remover
Jestco Products Buffing Supply - Anodize remover - 16 oz. (Powered by CubeCart)
When I see somebody telling you to check the part "every 15 minutes" I cringe. It should take just a couple of minutes or less if you have mixed the solution right. If the part has any steel/non-alloy pieces present you really want to get it in and out as soon as possible.
When the anodizing is gone there will be a black or gray residue left. You must remove this immediately. Use a brass bristle brush under running water to do that. It's important to remove this oxidation quickly and thoroughly rinse the part of any stripper.
Wear long gloves, and eye protection. A respirator is advised if you have one. If not do not hover over the pot.