To clean the aluminum, I use SOS pads with the blue soap, under warm water. The soap helps as a lubricant in keeping the pad from scratching. Even though there shouldn't be any difference, I found that the pink soaped pads don't seem to do as nice of a job in getting the aluminum to shine.
One thing that I see a lot of, and would like to point out. When you buy a tractor that has the serial tag painted over, do yourself a favor and DO NOT use a dry steel wool pad or fine grit sandpaper to strip the paint so that you can reference the serial number. When using these methods, you are grinding the raised letters of the tag down to the point that it makes it very hard to restore a tag. If you need to remove the paint from a tag, spray the tag with WD-40 or some other type of lubricant before using something like a steel wool pad.