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Vinegar works on salt because salt is a base, whereas vinegar is an acid. The combination of the two neutralizes the pH levels of each other and makes the final compound as neutral as water.
Using an acid-based cleaner such as vinegar may cause further corrosion if that film is not a base.
CLR may work if it is lime, but like vinegar, it may not be good on the monkey metal used on airsoft guns.
Your best bet is to try a tiny bit of each cleaner on small inconspicuous areas, see how well it cleans and leave it for a couple of days to see any longer term effects.
And as usual, try water too. If it cleans it up, dry your gun well and wipe the gun down with a rag that has some silicon oil in it.
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