1. Line a glass bowl with tin foil. 2. Place your tarnished sterling silver jewellery into the bowl. 3. Sprinkle a generous amount of baking soda powder over the jewellery. 4. Pour boiling water into the bowl 5. Let sit for a few moments 6. Remove your jewellery from the bowl and rinse with warm water. Your jewellery should be tarnish-free!