To clean pennies, make a vinegar solution, and let the penny soak for five to 15 minutes before rinsing and drying the penny. Polish it further with baking soda if the shine isn't satisfactory. Avoid cleaning collectible pennies that have numismatic worth, as cleaning t...
One way to clean old pennies is to soak them a solution of salt and vinegar. A mixture of ¼ cup of vinegar and 1 tablespoon of salt cleans 20 to 30 pennies in about five minutes.
To clean with vinegar, mix together one part vinegar and one part water in a spray bottle. Test the solution on a small area, and then spray the entire surface to be cleaned. Wait a minute for the cleaner to loosen dirt, and wipe with a soft cloth.
The best juice for cleaning rusted pennies is lemon juice. The amount of vitamin C is very strong in lemon juice.
The acid level in lemon juice makes it ideal for cleaning pennies, according to About.com. The juice should be diluted with water, with salt added to the mixture. The pennies need to be left to soak in the mixture for five to 15 minutes and then removed and dried.
Juices with an acidic base, such as lemon, dissolve the tarnish, which is copper oxide, from a dull penny. Other substances, such as Coke, Pepsi and vinegar, also make a penny shiny again.
White vinegar is a solution that can be used to clean gold. Soaking the gold in the vinegar for up to 20 minutes then rubbing with a soft cloth can restore its natural sheen.