I finally invested in one of the lesser-priced ultrasonic cleaners offered on Amazon. I have been happily cleaning eyeglasses, pens, and anything else within reach that needs to be cleaned. Since it is stainless inside, I put some Marvicide in there and cleaned a few DE razors. I let them soak for 15 minutes and then ran them through the three minute cycle twice. PEN RELATED QUESTION: is Marvicide or its more popular cousin, Barbicide, safe for fountain pens? It is diluted according to package directions. I thought it better to be safe than sorry. Thanks, -Steve