what is safe to clean pewter
The Cleaning Process: 1  Wash your pewter in warm water with a few drops of dish soap, rubbing gently with the sponge. 2  Rinse with warm water and dry thoroughly. 3  Make a paste of 1 tsp. salt, 1 cup vinegar and about a half-cup flour.  Apply paste to pewter, and rub gently with a soft cloth using a circular motion.