Recently inherited Model 17-4 made in early 1980 with pinned barrel. According to my relative; "it got wet one time". Ok. Overall it's in very good mechanical condition with some loss of bluing in a few "water spot" looking areas but I do want to inhibit any further corrosion and stop some minor rust/pitting that has appeared. These pics show some on the left side plate and frame. I do not intend to have it re-blued. To remove the corrosion and stop further damage I'm looking for some good suggestions that will do that without removing the bluing by me attacking it with something too aggressive. Thanks for your help.