Soak it in sour curd & then wash it with soap water with a clean and soft cloth.Thats what we do in our home.

The present invention relates to a non-abrasive metal polish or cleaning agent for objects, particularly household objects and ornaments, having surfaces of copper, silver, or chromium or of any alloy which is comprised of these metals either separately or together. The polish is characterized in that it comprises an aqueous solution containing 1-3% by weight nitric acid and 5-10% by weight thiourea or a derivative thereof.
Inventors:
Eriksson, Jan-Olof (S-931 31 Skellefte.ang., SE)
Application Number:
557171
Filing Date:
11/09/1983
Publication Date:
12/31/1985
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Referenced by:
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Primary Class:
106/3
Other Classes:
510/254, 510/255, 510/263, 510/269
International Classes:
C09G 001/18
Field of Search:
106/3 252/101, 102, 142, 541
US Patent References:
21325 ...more