Being a big fan of the 41 Magnum, I purchased a NIB current model 57. Shot like a dream...then I cleaned it. Used Hoppes on bore and cylinder charging holes and CLP on rest of gun. Immediately notice the bluing coming of the cylinder. Did not know what caused this. Called S&W customer service and was told they changed their bluing process and not to use Hoppes 9 as it will remove the finish. I have been using Hoppes for as many years as I can remember and never had a problem with my blued Smiths. I was absolutely dumb struck looking at my brand new, very expensive 57. The rest of the 57, entire frame was just like new. I sent it off to S&W for review of what happened and what I can do. Currently my other 41 is the Scandium/Titanium 4 inch that shoots like a dream. I know that the titanium cylinder can be an issue for cleaning, but I have not had a problem in several years of use. Being careful with most things I do, cant quite accept this mistake. Still a fan of Smith as I have several and will continue to shoot and clean as Smith informs me. Thanks for listening.