For a corrosion inhibitor, there a good many that work. My favorites are FP10, Corrosion x, Kroil, Rem oil, and Birchwood Casey sheath. The last comes in foil packets like glasses cleaners, I always have a few of those with me, for when I get caught in a rainy situation, and wipe the firearm down as soon as possible, it has saved my bacon more than once. Of the above, I like FP10 the most, as it protects and LUBRICATES WELL, Rem oil does a good job of both, but Corrosion X and Kroil protect well, but don't lubricate at all. With any of the above, I wipe it on liberally by hand, then wipe off with a clean dry cloth.