Cleaning and maintenance?
Well, blades get wiped down with mineral oil each time they go back into the safe, even if they’ve only been out for pictures. Overkill perhaps, but I keep a lightly oiled swath around for the wipe down.
Other than that, whenever it needs it.
When something feels gritty, the action is slowing down, or it looks dirty, it gets cleaned with copious compressed air and a bit of lube. Sometimes, if needed, it’ll get a light solvent like lighter fluid, silicone spray, or WD 40, followed by even greater volumes of compressed air. More often than not, that’s enough.
If it’s still not to my satisfaction, it *may* come apart to some degree, depending on the knife.