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I usually rinse the tubes out immediately after testing and let them air dry before storing them. To clean the build up out of them, I twist the end of a paper towel until it fits into the tube, after it's in the tube all the way, i'll twist it around till all the build up is gone.
I'm sure there are devices out there that are more specific for the job, but the above works for me. Be careful not to put to much pressure on the tube as they are thin glass and will easily break.
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