Over time the reaction between the metal used in sporting or military medals and oxygen in the air will form a patina on the surface. The patina is a fine coating of oxide on the metal giving it a darker, smudged look. Most collectors prefer medals to have the patina, since removing it could damage the medal. Cleaning wooden or non-metal medals is not recommended.
Used a can of compressed air to remove any dirt or debris from the medal.
Mix 15 ml (1 tbsp) of soap with 500 ml (2 cups) of warm water.
Saturate a rag in the soap mixture; rub the medal lightly with the rag to remove any remaining dirt. Use a cotton bud to get the dirt out of small crevices.
Dry the medal with a clean cloth.
Do not use abrasive cleaners on metallic medals.
Avoid using any chemical cleaners on your medals, because they may damage the finish.