I blasted some aluminum parts and it will clean them up, BUT you will have a grainey appearance and not smooth. I am not too happy, so I would recommend against any sort of blasting media. What I resorted to was then sanding the pieces which gave them a really nice shinny appearance. Then, a buffing wheel for almost like chrome.

I did my Valve Cover with just sanding in successively finer grits, e.g., 600, then up to 1000. Then, I buffed it. My first time and I was really happy with that. However, that is likewise not factory looking new since it is smooth and super shiney.

I even tried the boat aluminum cleaner stuff, and it still had some scale left over, so you will end up with grainey and grey with blasting or really shiney or smooth with sanding and buffing.