to get the best possible shine from aluminum you have to sand all imperfections out of them, right down to the very fine machined finish, any pits, scratches... treat them like paint, start with a coarse paper to know everything down and go finer in steps to the point you can polish them,there are so many different way to polish once you get to this point. that is the only way you will get a real reflection out of them. if you polish the surface you have now, they will improve, but you can still get them better.