Removing oxidation from aluminum

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    I am new to buffing aluminum and I have recently purchased your 3/4 eastwood buffer. The problem I am having is in the beginning stage. I am polishing up a lot of aluminum valve covers but, they have heavy amounts of oxidation on them. I tried cutting through it with tripoli compound with no success. I have done a few of the valve covers so far and have been starting with 60 grit all the way up to 400. Is there a chemical solution on the market that will clean up the oxidation so, I dont have to sand so much on a part. I know that a bead blaster will do the job but, that is not in the budget at the moment. Every valve cover that I have done so far has ilnvolved hours of sanding and there has to be an easier way. Thanks

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