How to clean pewter?
Pewter will stay shiny if you keep it away from heat and harsh chemicals. This is why you need to remove your pewter jewelry when engaging in intense physical activities such as exercise, house cleaning, dish washing, and others. Pewter is also a soft metal that can easily bend.
If the pewter jewelry tarnishes, soak it in a warm solution of water and dish soap for about 15 minutes. Use a sponge or soft brush to rub it gently so that the dirt can break off. Rinse under clean water and wipe with a soft cloth to dry.