When I did my restoration/rebuild of my XS650 I polished all of the aluminum up with Mother's and some Brasso and 0000 steel wool on the bad stuff (yes, it says you're not supposed to use it on aluminum, but it does a good job of cutting through the anodization coating). After the initial polishing they required very little maintenance. Just a little cleaning once in awhile was all, and a nice soft patina remained that was easy to maintain. Had that bike for about 3 years and rode it 19,000 miles, and it still looked good. Hand-polishing those aluminum parts is harder than it seems (getting off that old anodization) and downright grimy work! Bet you have some dirty fingernails to show for your effort. As a sidenote, most of my 30 year-old chrome was still beautiful, even after sitting in a barn for years. They used to do it right back then. Good luck! Those old bikes are great fun.
John Scribner