Thought I would share some results.
Hardware wiped with 99% denatured alcohol.
Tossed into one of these for 12 hrs. with ground walnut shells.
http://rocktumbler.com/lot-o-tumbler/
Parts blasted with air to get dust off. Wiped with damp micro fiber and then chrome polish and light buffing wheel.
Another wipe down with 99% alcohol and good to go.
Creighton