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how to perfectly clean copper details to do this you need the copper piece itself in my case a copper bus if itamp;#39;s covered with oxides they must be removed this can be done mechanically with sandpaper or Emery or chemically in my case the solution of hydrogen peroxide and citric acid is used we pour it into a suitable container and immerse the copper piece for 10 to 15 minutes and then we thoroughly rinse it with plain water next we take liquid tin pour it into a container and immerse the preceded fat-free detail and wait for 10 minutes the thickness of the tin coating depends on the time the detail is in the solution next take out the detail and reinstorally the thin layer will prevent the formation of corrosion and your detail will shine for a long time