Tokens are usually made of Brass, and most of the commonly used cuboard or refrigerator ingredients contain a natural acid, such as vinegar, Tobasco Sauce, ketchup, tomatoes, milk, and lemon or lime juice, all of them will remove tarnish from Brass. The tarnish washes away with an acid rub or soak. You might have to remove the lacquer cover if the brass is new. Do this by submerging the brass in boiling water with a few teaspoons each baking soda and washing soda (available in the laundry section of the supermarket). Once the lacquer has peeled off, polish dry, then you can do an acid soak or rub.