I use Mother's Mag Wheel polish, 0000 steel wool and some clean terry cloth rags. It's easier to pull the wheel off and work on a bench, too - better results.
I just scored a set of those exact same wheels to put on my '75 1.8L

- What size lug bolts can I use and where can I find them (shiny too

There are NONE to be found in my little mountain town...