Reddit reviews Randy's Pipe Cleaners ~ Soft Bristle ~ 132 Ct ~ 100% Cotton
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Randy's Pipe Cleaners Soft Bristle 132ct 100% Cotton
http://www.amazon.com/Randys-Pipe-Cleaners-Bristle-Cotton/dp/B004OF3SHY/
These are what you need.
if you do use pipe cleaners, use the 100 percent cotton ones. http://www.amazon.com/Randys-Pipe-Cleaners-Bristle-Cotton/dp/B004OF3SHY
the chenille stems (arts&crafts type) will shed and stick inside the unit and can melt releasing toxic crap into your lungs.
also, you can completely submerge the mouthpiece in ISO and I find that, combined with using an old toothbrush keeps it from sticking.