If sodium chloride attached in the metalic instrument how can i remove all NaCl from there easily?
It might not be easy (depending on what instrument. and what part of it is attained), but the better approach is to use plain distilled water and a nonabrasive sponge. Lots of water to be sure it's all gone.
If it was an electrode or another such sensitive piece, sorry, you may have lost it. but you may try cleaning it with water first, then applying something like calomelsolution.
If it shows signs of oxidation (and is not a critical functional part of the instrument, like a pH sensor or other such sensor) you might want to use either some rust converter or some non-abrasive silver cleaner. Try either one, or both. those chemocals will convert oxidised molecules into some shining-looking chemicals, thus protecting against further oxidizing. In Most cases you´ll even be able to paint it on the same color of the instrument.
Sodium chloride accelerates the process of corrosion when a metal surface is exposed to it. For cleaning purposes,sodium chloride can be removed efficiently from a surface by soaking and washing the metal in water treated with specific salt -removing chemical such as Salt-X or Salt-Away.
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