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Create a cleaning paste with vinegar, salt, and flour. Apply the cleaning paste to the copper. Polish away the paste with a microfiber cloth. Rinse and dry the copper.
Combine a half cup (118 ml) white vinegar and 1 tbsp (15 ml) of salt in a mixing bowl. Mix together these ingredients with a spoon and add flour to it until all ingredients are evenly distributed and a thick paste is formed. Use a plastic spatula or a similar tool to apply the paste to the tarnished copper. Completely cover all tarnished areas with the paste. Allow the paste to remain on the copper for 10 minutes for light oxidation. Heavier oxidation may require the paste to be left on for up to an hour. Use your best judgement. When polishing the copper, try to follow the grain (direction) of the metal. Use brisk motions when polishing. Detailed parts of the copper may not be accessible with a cloth. In these cases, use a cotton swab or a soft bristle brush. Rinse all surfaces of the copper under clean water. Dry the cleaned copper completely. Any water remaining on the surface of your copper will likely leave behind water marks. When dry, buff the copper with a clean, dry microfiber cloth. If, after removing the paste, oxidation remains, clean the copper in this fashion once again.