Welcome to the forum Stockb0y,
Seeking the best answer I have been reading all the threads on cleaning nickeled S&Ws. My first choice in S&Ws has been stainless for convenient cleaning followed blued for good looks and last nickeled so I have limited experience with nickeled S&Ws. The best answer that I have come up with is: only use abrasive polishes like Flitz every 10 to 20 years or so because nickel is fairly soft, don't clean off the black doughnuts around the the charge holes on the front face of the cylinder, use any bore cleaner sparingly and don't leave it on for long, and don't use penetrating oils for preservative.
Much of the information posted on cleaning nickeled S&Ws has been conflicting and based on old rumors. A popular belief is that you should not use bore cleaners designed to remove jacketed bullet fouling, especially those that contain amonia because amonia would attack a copper undercoating. The trouble is, S&W never undercoated with copper and moderator RBurg has posted that amonia does not react with nickel. Where nickel plateing has flaked off S&Ws you see steel, not copper. It appears that RBurg is correct, but I welcome comments from chemists on whether nickel reacts with amonia. My gunsmith cleans his nickeled S&Ws with Hoppe's #9 which contains amonia, then wipes it off and stores them bare. Nickel doesn't corrode much at all but that does leave the hammer, trigger and blued parts at risk of rusting. He says to not use penetrating oils because they might get under the nickel plateing through sratches and at the edges of spots where the nickel has flaked off and most older guns are missing a flake or two. That is after all what penetrating oils are designed to do. However, to avoid using any bore cleaner designed to remove jacketed bullet fouling, I have used the penetrating oil WD-40 spareingly to clean lead bullet fouling out of nickeled S&Ws for decades without any problem. I wipe it off then oil with Hoppe's gun oil for preservative and lubrication. I am going to change from WD-40 to Rem Oil which is also very thin because Rem Oil is not designed to be a penetrating oil so far as I know and I just purchased my first nickeled S&W that is missing a few tiny flakes of nickel. I have mostly reloaded with home cast lead bullets and can't recall ever firing a jacketed bullet in a nickeled S&W so I have had no need to use rifle bore cleaners and haven't used them to play it safe.
I welcome advise from experts and can only hope this helps Stockb0y a little.
Best Regards,
Gil