RIG or CLP
Few years back, I went through a dozen blued pistols, several shotguns and a few rifles, cleaned them thoroughly, then liberally coated the metal with RIG.
The handguns then slid into silicone sack ups. The long guns were simply stood up in the safe.
14 months later the owner returned after deployment and ALL was well. NOT too bad I thought for a safe, in an unheated garage on the NJ Coast.
I used to carry an M14 in my troop car trunk in a breathable canvas, soft case. Soon after we got them rust started to be an issue. TWO things seemed to work. A liberal coating of GI CLP or the RIG grease.
I'm sold on RIG. For my safe queen pistols in the collection I use a polish that's used by Museums. Apply it once a year and it's worked out nicely. Renaissance Polish.