When I was about 12, I asked my Grandpa if I could again see the original Model 1850 Foot Officers Sword that was presented to my ancestor after he blew the owner out of the saddle in the UnCivil War.
It had been hanging on the wall by a chain attached to the rings on the throat and middle mount of the Leather bodied scabbard for decades. The blade was horribly rusted from so many years being stored in the leather scabbard. I cleaned the rust off as best I could at the time, used Rig Grease (an excellent long term Anti-Rust Grease) on the blade and gave it back to Grandpa.
Another twenty or more years went by and when Grandpa passed, he left it to me as I was the only Grandson who had gone in the military. Unfortunately from hanging in the scabbard another two decades, it had badly rusted again, though not as bad as earlier.
This time I got instructions from the Marine Corps Museum and a couple other museums on how to clean it up and make it look similar to when my ancestor was awarded it. From then on, I have stored the Sword outside the Leather Scabbard and with a light coat of Rig Grease.
I have worn the sword in uniform from time to time, but always cleaned and greased the blade afterwards and stored it separately. No more rusting for the last 33 years.
Gus