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I've used Hoppes #9 to clean every gun I own nickel or blue. for nickel guns I use a brass bore brush for the bore and chambers with Hoppes #9. never had any damage and I never let my guns soak in HOPPES or anything else, either blue or nickel. for the nickel cylinder face I use a fiber brush to scrub lightly and that also includes the inside of the cylinder window. I been cleaning guns for 39 years and never had a problem with HOPPES #9. good stuff but there could be something better I don't know about. clean on.