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Hate to break it to ya, but the majority of sanding is gonna be based on elbow grease. What I did to all my aluminum parts was started off lightly with a 60 grit just to knock down all the rough casting and eventually work my way up to the finer grits. I used a black&decker mouse hand sander and a dremel tool w/ the extension for every opportunity I could use them. I generally stayed away from stronger tools for polishing because theres a good possibility for creating flat spots or gashing the aluminum. Overall its just going to take a bit of time and patience, but it'll come out really nice if done right.
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