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Ultrasonic cleaners are made for cleaning drafting pens and I used to have one for cleaning plotter pens back in the early days of CAD.I haven't a clue where mine went to. They still make these (dataprint.com has one for about $125.) <br /> <br />The KohINoor RapidoEze Pen Cleaner used in these is non-toxic and will clean dried ink without harming plastic so it should be safe for your use. (Testing is always advisable.) <br /> <br />Wayne
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