I soak the main mouthpiece on the herbalAire (I've got several so I usually wait until they all need cleaning) along with the glass bowls from my Vapolution. Then after they've soaked overnight, I finish cleaning with cotton swabs or pipe cleaners and put the alcohol dish in the garage and wait until it evaporates. I then scrape the dried residue off and add a little to my bowls for revaping. It's just condensed vapor so it's not like smoking pipe resin. Works great! :thumbsup: