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You can safely use Hoppe's #9 on the bore and chambers.
#9 is not a particularly harsh copper solvent like many are and it won't damage a nickel plated gun as long as you don't let it soak on the outside.

Just clean the bore and chambers as normal, keeping leakage wiped off the outside. Note that when cleaning, solvent will tend to leak under the ejector so keep that area wiped dry.

You can't nickel plate bores or chambers, those are bare steel.

There are more modern bore solvents around that supposedly won't harm nickel even if you let it soak.
Since copper fouling isn't the problem it is in rifles, what's needed for a pistol is a solvent that removes carbon fouling and helps loosen leading.
Hopefully someone who knows about these newer solvents will post some recommendations.
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