When considering how to clean a dirty coin, it’s crucial to understand that cleaning collectible or potentially valuable coins is generally not recommended as it can decrease their value. Patina and toning are natural aspects of aging and can actually add to the value and eye appeal of collectible coins. If you’re unsure of a coin’s value, it’s always best to consult a professional numismatist or coin grader for evaluation before attempting any cleaning.
However, for common coins with no significant numismatic value, several methods can be used to remove dirt and restore their appearance.
Gentle cleaning methods (recommended for most coins)
- Soapy Water Soak: A simple and safe option for surface dirt is to soak the coin in a bowl of warm water mixed with a few drops of mild dish soap.
- Gentle Rubbing: After soaking, you can gently rub the coin between your thumb and index finger or use a soft-bristled toothbrush to loosen dirt, [according to Real Simple].
- Rinsing and Drying: Rinse the coins thoroughly under clean water and pat them dry with a soft, lint-free cloth or allow them to air dry to avoid scratching, according to [Real Simple].
- Distilled Water Soak: Soaking a collectible coin in distilled water for a few minutes can gently loosen debris, [says Real Simple].
Cleaning methods for more stubborn dirt and tarnish (use with caution and only on non-collectible coins)
- Vinegar and Salt: Mix vinegar and salt in a non-metal bowl and soak the coins for a few minutes. The acid in the vinegar and the abrasive quality of the salt can help remove tarnish, [says Real Simple].
- Baking Soda Paste: Combine a small amount of water with baking soda to create a paste. Apply the paste to the coin and gently scrub with a soft toothbrush before rinsing, says [Real Simple].
- Ketchup or Lemon Juice: The acids in ketchup and lemon juice can dissolve tarnish on copper and silver coins. Apply a thin layer, rub with a soft toothbrush or cloth for a few minutes, then rinse.
- Hydrogen Peroxide: A diluted solution of hydrogen peroxide can be used to soak coins and help remove stains and tarnish.
- Cola: Soaking coins in cola for a short time can help remove tarnish due to the phosphoric acid it contains. However, it’s important to rinse the coins thoroughly afterward.
Important considerations
- Do not use abrasive materials like wire brushes or harsh chemicals, which can cause scratches or damage the coin’s surface and significantly reduce its value.
- Modern coins, especially those made after 1982, are primarily zinc and should not be cleaned with acidic substances, as this can cause blackening.
- Handle coins by their edges to avoid leaving fingerprints and transferring oils, which can cause discoloration and damage over time.
- Store coins properly in acid-free and PVC-free holders to protect them from environmental damage.
Note: If you believe your coin is valuable or collectible, it’s strongly advised to refrain from cleaning it yourself and seek expert advice from a numismatist to determine the best course of action. Cleaning a coin can significantly reduce its value and collectability.
What is best to clean dirty coins?
Vinegar and Salt
Mix vinegar with salt. Place pennies in the solution and let them sit for a while, and then use a clean, soft toothbrush to clean any dirty areas. Rinse the coins, and then polish them with baking soda paste.
Which liquid cleans coins the best?
Good point! Acetone is the only thing you can use that will do anything and not mess with the coin.
Will coke clean dirty coins?
From my experience, And returns them back to almost as good as new.