Easy question:
I took my 5" Model 18 out for quick trip down to the Everglades.
It went in its' sheath and was not needed for any survival duties.
Or I wasn't creative enough to find a use for it out in the swamps.
But of course, when I got home, the bladed was smudged from handling and going in and out of the sheath and the Brass Handguards had fingerprints all over them.
It took just a few minutes with some Flitz to get it back in it's more acceptable, spotless condition.
Am I the only one who, after using my 18, re-polishes it after even the shortest handling, much less even using it to cut something?
Don't have the same problem with my Kitchen Duty Model 10's!