You can clean them. You can technically disassemble them but it involves preening over pins and whatnot. It's a hassle. A good soak in warm soapy water and a scrub with an old toothbrush can do wonders. If it's seized by rust WD-40 is your friend.

The Cybertool really is the best of the Victorinox knives. Unfortunately, I lost mine 😢.

Mine has been rusted shut for ages. I wish you could disassemble and clean them