Mark Batterson and Heather Zempel wanted to know: We need to distribute 4,000 shiny pennies to our congregation. The U. S. Mint will not give us new ones, so we have to obtain grubby old pennies from the bank.

What houshold chemical(s) should we use to reverse the chemical oxidation on old pennies?
32%: a. Vinegar and Salt
15%: b. Ketchup
47%: c. Lemon Juice
6%: d Everything is an experiment.