I just finished this project. I used off brand familycare unscented. Rubbed with it an old washcloth, then LIGHTLY buffed it with a buffer block to help break up the seal of the ink then rubbed with washcloth, focusing on one section at a time. About 10-15 minutes of work gave me a lovely demonstrator pen with minimal barrel clouding.
This was based off an ehow tutorial I found while procrastinating doing my homework.
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