I don't use it anymore, BUT, when I did, I tried a bunch of different things.
I use skitogan, or chaga now.
Enough that it absolutely pissed my wife off making it in the house. It took 2/two times before I started doing it outside.
JUST MY OPINION, AND EXPERIANCE.
Had real good luck with cheap cotton wash rags, had a lot of crevices to catch sparks.
I used cotton balls, and cotton gauze too, that worked pretty well.
I did use T-shirts too, worked pretty well.
BEST, for me, cheap cotton wash rag. (the first one I used was a new one, that may have added to the pissed off wife)
Ended up using old ones allocated to dust rags.