Step 2Take apart over the sink
You can get your fingernails under the edges of the blue stopper and pull out the tube assembly. At the other end of the tube from the blue stopper is a white stopper. Pull that out and rinse everything well.
The reservoir half is actually colored plastic, which I didn't know for the first pen I "converted." I kept rinsing and wondered why the color-water wasn't coming out. I felt really smart when I realized the reservoir half was colored plastic.
Just rinse until the water runs clear (a white sink helps here). It's OK if there're still a few drops left; you're gonna squeeze the pen and flow water through everything anyway.
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