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I am looking for information on cleaning aluminum.  The surface in question
is approximately 25 years old and looks as if it was originally polished.  I
have removed some areas of whitish oxidation with gentle scrubbing and a mild
detergent, however, the surface below seems to be pitted.  Although what
appears to be  pitting may also just be residual oxidation that I have not
been able to remove.  I have not been very aggressive in cleaning thus far.
Also there are areas where the surface has become discolored to sort of a
bronze tint.  Has anyone has any experience, luck, success with returning an
aluminum surface be returned to its original appearance, and if so, how?

Thanks,
Mark