Using Ultrasonic Cleaners by Matt (penhabit.com)

https://www.youtube.com/watch?v=ShLJxhrPmCI Ultrasonic cleaners can be a bit of a mystery for new fountain pens users. What are they? Why should you use them? How do you use them? Are they necessary? Are we all just getting a little overly anal retentive about cleaning our pens? In this

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