Quote:
Originally Posted by ABNRGR
I am told that Hoppe's No. 9 is not recommended for nickel plated finishes because it contains ammonia.
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This is another case of internet myth. Hoppes #9 does not and never has had ammonia as an ingredient. Use Hoppes, just don't leave a wet coat on the Nickel, or soak plated parts in it.
You will also see that the reason ammonia is bad for Nickel plate is there is Copper under the Nickel! This is also incorrect regarding high-quality firearms. Bumpers yes, cheap foreign guns maybe, S&W never!
Most firearms maintenance products are fine for Nickel, if not there is usually a warning on the labeling. You should avoid products containing ammonia, it's easy, just read the list of ingredients on the labeling! They won't tell you everything, but they will warn about hazardous ingredients.