I've read that ammonia is good, but where on earth so I get that from!? I've also read about heating the crank up so as to expand the alloy but will this not tarnish the crank?
http://www.google.co.uk/products?sourceid=navclient&rlz=1T5GGLL_enGB253GB258&q=ammonia&um=1&ie=UTF-8&sa=N&hl=en&tab=wf
@Pesto started
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http://www.google.co.uk/products?sourceid=navclient&rlz=1T5GGLL_enGB253GB258&q=ammonia&um=1&ie=UTF-8&sa=N&hl=en&tab=wf