We are leaving in a couple of days and I've been trying to clean the pre-1983 pennies that I've collected. I'd like our DS's to be able to press them when we get there and I'd like to have clean pennies to start with, if I can. I know I've read about cleaning them here and have tried a couple of ways which just are not helping. First I tried salsa and it cleaned only about 2. The others brightened up a bit. Then I tried a solution of vinegar and salt. It seems to have tarnished them even more. Now what do I try? Anyone with any suggestions? TIA!