[header] How to clean pennies with vinegar [title] Gather together the pennies you want to clean. [step] Go through your wallet, drawers, car and anywhere else that change tends to pile up to find pennies in need of cleaning. This process will work best on coins that are heavily tarnished or have a lot of stuck-on grime. 
The combination of vinegar and salt will cut through dirt and buildup effortlessly. [substeps] Vinegar is most effective for cleaning copper.