I have read that Hoppe's No. 9 on nickel plated firearms.

Applying a healthy dose of Hoppes No. 9 to the surface and letting it sit for hours could constitute "soaking". As previously stated, copper dissolution is the issue, but S&W did not apply a copper intermediate layer beneath their nickel finishes. Colt and likely others did and there may have been aftermarket refinishers who plated first with copper, then nickel.
 
Back when I was a young policeman, I finally saved enough to get my own gun instead of the model 15 I was issued. Got my 1975 Python in nickel. Even had a Don Tedford action job. It was sweet. One night after too many "OLD Milwaukees" I left it laying on the newspaper I was cleaning it on, with Hoppe's . The next day when I finished up the barrel had about a one inch long clouded area where it touched the soaked paper. Wasn't happy but didn't bother me then like it would now, ha.

And NO, I do not have the gun though I have tried to find it.
 
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