Dunno how dull you are willing to go but I have made some beat-up neglected aluminium parts look pretty new with an HarborFreight Soda Blaster. It's not chome/polished but it's not pitted like other blast media.
Blast and rinse. Couldn't be easier.
Warning. DO NOT BLAST INSIDE YOUR GARAGE (or outside with the garage door open) You will want to hose off everything within 20-30ft of your blast zone.
This is not me but it is an inmate here: (actually, I didn't take a picture of my garage when I did it right in front of the open door... but when I turned around after a good hour of blasting a table full of parts this is pretty much what I saw!)