With the Bubbler mouthpiece, there is a trick to getting them clean. You can use a Cleaner and just dump a bit in and shake vigorously, or let sit overnight. You can do the same thing with Rubbing Alcohol, soaking works best with alcohol. The best way to get the liquid out is to just Blow it out the bottom.  To help with any hard to get off grunge, you can also add some salt. We feel the the 710 cleaner is the best cleaner there is. (good time to do a small upsell)