Hit it with some Mothers and a microfiber and see where it is. Work it in until the polish turns black (aluminum dusts black). You may be surprised. If you want it shinier, bust out the sand paper and work up to 2500 grit or so. Buffing wheel and compound is great, but Mothers is good stuff and not everyone has a buffing wheel. Mothers is one of the few over the counter car care products that really is the best. I dabble in automotive detailing and polishing aluminum is something that I have experience in.
Note: Raw aluminum is very soft, so make sure you use a high quality microfiber (no melted edges, they can scratch the surface) and keep everything CLEAN.