The IGO and ECHO have really tight tight poly filling. I have found boiling is fine for cleaning, but for getting good vapor, taste, and no burnt dry puffs, i use a large sewing needle and stab the filling, pour some ejuice all around the middle wick, fluff and stab, fluff' and stab'..more
juice, and more fluffing and stabbing'..lol. but it works.
juice will then sink completely in. Even Vg juice.
I use a hair dryer, i have no patience for waiting over nite for these suckers to dry. Havent had one stop working because of a hair dryer.