DAMNIT, ok 5 posts, last one i promise

Serious practitioners of numismatics (the study and collection of coins, paper money and medals) will tell you that you shouldn't clean your coin collection because collectors prefer that "natural look." But, hey, they're your coins and if you want them shiny, here's how to get them that way with minimal damage.
Instructions
STEP 1: Handle coins by the edges to avoid putting fingerprints on the flat surfaces. STEP 2: Avoid silver and other metal polishes - even jewelry polishes. They are much too harsh and will leave tiny scratches on the coin's surfaces. STEP 3: Soak the coins in olive oil or soapy water for a few days and then rinse them well with clean water. STEP 4: Try non-abrasive cleaners such as denatured or isopropyl alcohol, acetone, or an ultrasonic jewelry cleaner (with water) if the soaking doesn't do the trick. STEP 5: Blow dry or pat cleaned coins with a soft cloth, not tissues or paper towels. STEP 6: Never rub the coin - unless it's your good luck charm.

i would do the olive oil, rather than the water

Quote Originally Posted by tootsie roll
What type coin is his? A dime? A mercury dime?
Just so you know, sometimes it is better to NOT clean them. Some dealers like them aged and they can always clean it if they want to.
Now, if this is for you personally to have and keep, you could try Tarnex. (it smells bad tho)
no no no, i did that once when i first got into cleaning, ruined a 10 dollar coin almost instantly... tarnex is the worth possible thing to clean with it's very abbrasive.

edit: ok, not 5 in a row, someone broke my chain