I recently discovered by accident that cotton balls work just fine for me. My mini Protank was leaking and I just needed to replace the flavor wick. I was out of new heads and decided to use whatever was on hand. I replaced the flavor wick with a little of one of my cosmetic cotton balls and it solved the problem, so I replaced the flavor wicks on several others.
It worked beautifully on all of them and I was so proud of myself. Thought I had made a grand discovery. Then I started to worry that it might not be safe, so I posted my concern on the forum. Wow! No grand discovery after all. The people on this forum have been doing this for a while and seem to have tried just about everything. Someone is going to know the answer to just about any question you may have about vaping. More than one poster suggested that I use the Peaches & Cream yarn from Walmart. Went out next day and bought some. Haven't used it yet (cotton ball wick still working ) but trying it next time I get in a pinch. Gonna check this yarn out too.