Quoted from Colsond3:Try CP100 or Flitz. Flitz preferably. Just don’t push too hard. If the dirt or grime is deep and ate into the metal or oxidized, it may be hard to make it look great without damaging the artwork.
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I absolutely would NOT use anything like that on a Bally apron from the 70's. As others stated above, you look sideways at those aprons and the paint wipes off.