Tarnished silver is no match for this aluminum foil “recipe.” Bring one liter of water, one tablespoon of baking soda and one piece of aluminum foil to a boil. Drop silverware in the pot for 10 seconds (longer if it’s very tarnished), then remove using kitchen tongs. Magic! If built-up tarnish persists, make a thick paste with 1/4 cup baking soda and two tablespoons of water. Apply with a damp sponge, then rinse and dry.