Pewter Cleaning Tip
Before I polish my pewter plates, I soak them in extremely hot water for several minutes in a dish pan.
I take a pad of super fine steel wool (0000), place it in the water, squeeze it out, and apply a teaspoon of Dawn dish liquid. Then I take the plate out of the water and begin firmly rubbing the steel wool in a circular pattern from the middle to the outside diameter of the plate. Repeat this rubbing on both sides and dry the plate with a soft cotton towel or cloth.