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Your in luck!
I have a magazine artical on removing anodised finishes from aluminium. Mag is Rc Driver august 05.
They highly recommended a chemical called Greased Lighning.
They said some people used Drano and Easy Off Oven Cleaner, but results with those were quite sketchy.
They left the aluminium parts in the solution for 40 mins with no adverse effects on the aluminium.
Web link for the product http:http://www.greased-lightning.com
Hope this helps you out
For the love of the hobby