try this
How big is this piece? Makita makes a high speed drill that you can use a 6" sisal wheel on. Apply 80 grit greaseless compound to the wheel and sand away. I polish sportbike frames and there is the same type of casting on them. This should take care of everything except for the real tight spots. I am trying to coat some felt bobs with the greaseless now to get into the crevices, but I'm not sure how that will work. Keep posting those pics. It helps with the responses.
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