On Fri, 25 Feb 2011 22:53:04 -0800, David Nebenzahl
wrote:

I know vinegar is really good at cleaning metal. When I work on old
things (e.g., cameras) with schmutzed or hazed brass or chrome parts, I
throw them (the parts, not the camera) into a vinegar bath. Brightens
'em right up.

Vinegar is a miracle. You can even eat it.