Get yourself some 400 grit sanding pads. They kind of look like a sponge with sandpaper attached to them. Get some 00 or 000 steel wool and some BlueMagic metal polish from your local auto parts store. Start by sanding the bare aluminum until it's nice and smooth. Use a lot of elbow grease at first to get all of the deep scratches off. Then apply less and less pressure while sanding to make the scratches as light as possible. The whole thing should be a uniform dull grey or almost white. Once eveything is sanded evenly, no deep scratches, pits or gouges, take a tiny piece of steel wool, dip it in the polish(just a little bit of polish goes a looooong way), and firmly press on the aluminum while making small circles with your finger. Continue doing this in one area until the polish turns black and disappears. Wipe the area clean with the inside of an old tshirt. Then take the tshirt, wrap the edge of it around your finger so the inside is facing out, dip it in the polish and do the same thing you did with the steel wool. Small circles, hard at first, gradually reduce pressure, then buff
