Unfortunately, nickel plating tarnishes quite easy, especially from oils from our hands. I am not sure how bad it is, but for a mild cleaner, use a 1 part vinegar to 4 parts water solution and a soft rag to wipe it with. For moderately bad tarnish, lemon juice and baking soda are ok, but you would have to be ever so careful not to get any chucks in the keys or embouchure hole. If it is quite bad, but obviously has not damaged the structure of the flute, pure ammonia is good, but be sure to wear gloves and use cotton balls to swab it, followed by a damp soft rag for "rinsing". I've used this to clean silverware, etc.
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Unfortunately, nickel plating tarnishes quite easy, especially from oils from our hands. I am not sure how bad it is, but for a mild cleaner, use a 1 part vinegar to 4 parts water solution and a soft rag to wipe it with. For moderately bad tarnish, lemon juice and baking soda are ok, but you would have to be ever so careful not to get any chucks in the keys or embouchure hole. If it is quite bad, but obviously has not damaged the structure of the flute, pure ammonia is good, but be sure to wear gloves and use cotton balls to swab it, followed by a damp soft rag for "rinsing". I've used this to clean silverware, etc.