Rusty.
My firearms take a bit of a abuse in the canoes, snow, and transition from extreem cold to my humble abode.
Have been using a product called "Barricade" with very good success. It will withstand a five day saltwater dunk! I see it in most racks that carry gun cleaning supplies. It does not leave a film to pick up grit and a very tiny drop goes a long ways.
I have also been putting it on freshly sharpened broadheads to keep the cutting edge from pitting over time. Shows good promise there too.
Other stuff works in the rust/oxidation prevention department but this stuff simply will not pick up any extra grit
My Best,
Scotty