Stains on old porcelain can also be helped with a a bar of Fels Naptha or Octagon soap dissolved in one gallon of hot water with half a cup of mineral spirits added. Brush vigorously on the surface. Note: Be sure that the "stain" isn't just the metal showing through a layer of porcelain worn thin before you brush with anything too coarse. To brighten old porcelain, try rubbing with a solution of salt and turpentine.
Source: Fingerhut Tips
By duckie-do from Cortez, CO
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