Have the same problem about the quick corrosion. Stainless steel watches that are water-proof to at least 30m have helped a lot. For me, it was actually a good thing to have this "problem" when I did work in a gun shop as a smith: I was able to pull cold bluing off metal within 1 to 2 minutes showing that some folks were less honest about their wares than others. Especially when dealing with folks talking about their special "Cobalt bluing" that was a speciality treatment offered by S & W back in the lat 70's. I pulled a lot of cold blue off during that time in my life. Lite oils and a clean cotton cloth have been a constant friend since that time when dealing with historical items.