clenaing pennies didn't work.

[mm]

Hmm. I might have that or something simliar under the sink. I have Brasso and a couple other things.

[Thomas]

Buy a rock polisher (tumbler) at the toy store.

Or perhaps a brass polisher (Bullet shell casing polisher)

[JIMMIE]

IF the Cu is gone you just cant shine zinc

[dilbert firestorm]

what about this one?

[Tony Hwang]

Tubling will make the pennies shiny brand new.