I have a recent production 617 and I have been trying to clean the cylinder face, but nothing seems to work. I use simichrome polish on my other revolvers and they clean and polish them, but this particular gun seems to have some sort of clear coating on the cylinder face, the cylinder is steel not aluminum. The other Smith's I've owned are all older revolvers and with a little bit of polishing they look great, but this gun I just can't figure out. Maybe their is some sort of difference on the finish of these newer guns? What is the best cleaner for this problem? Maybe the simichrome works best as a polish, not a cleaner? What do you folks use to clean your cylinders? Thanks.