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If you visit AB tools or have a similar place near by there are various pads that can be used to clean up the surface in different grades , starting at coarse working your way to fine , some of the 3M style pads like this may help you"Coarse medium or fine Scotchbrite Rust Paint Removal Remover Polishing Buffing Mop 8" x 2 Row" can help get into the center hub , it depends what surface finish you want , like you can have a cleaned up surface and then move on to hard mops and soft mops with various compounds and you will be able see the cast surface below , still easier to clean , depends how much work you want to do , and as polishing can round things off, as MTD said some bits can be machine skimmed to sharpen up the lines . You might need a decent 200mm bench grinder or similar with taper or just send it to the polishers .
If you visit AB tools or have a similar place near by there are various pads that can be used to clean up the surface in different grades , starting at coarse working your way to fine , some of the 3M style pads like this may help you