Well, no...not polish. I don't want the non shiny parts to suddenly be made shiny. I just want the embedded or what seems to be embedded dirt and oil to come out so that the frame and swinger look new...Anodizing is probably the only way to make the Aluminium look new, or what?

Anodizing is probably the best then...

What's the thickness that anodizing adds to metal?
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Grr, boyo....500cc bi-stroker. Heaven awaits