Wrap sharp tools in paper or plastic to grab and work them on their rotation axis a good 20 times or more.
Syem, on one forum somebody mentioned that ultrasonic is not good for fiber scales. I think oil or Ballistol are enough.
Ooh that's interesting (and worrisome) and certainly requires consideration! Is it because of the vibrations or because of the extended submersion of the fiber in a liquid?I've heard people using "professional" ultrasonic baths and leaving stuff in them for up to 12 hours...I usually make 2 sessions of about 7 minutes and immediately and thoroughly dry the knife. I haven't cleaned many fiber knives but I don't recall ever having issues.