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@Lachy
anodizing is just a layer of aluminium oxide that is a bit thicker than will occur if you just leave the part to oxidize naturally. it can be tinted to be blue, black, green etc or left clear. i think your part was probably anodized black and i would suggest oven cleaner/caustic soda as your first port of call. don't worry about special polishes, if the polish you have gives you a nice shine then just stick with it. the part may discolour slightly when you put oven cleaner on it, but don't worry, any discolouration will just polish right off.