The open construction is pretty forgiving as far as letting the knife dry, so you could do what I do. Rinse it out with hot water thoroughly to get all the lint and dirt out, maybe scrub it with a pipe cleaner to dislodge the tough stuff. Let it bake in the sun until dry, then put some oil on the pivot. There isn't much to it, really.
If you were comfortable taking the knife apart (I'm not) you could get a lot more into it.