Ultrasonic cleaners, overkill for a DV in my opinion, unless your cleaning 100 at a time. I went down that road to clean other things that go bang and it was overkill for even that. Now it might be good for cleaning a cooling stem or something you can’t clean with a qtip, pipe cleaner and warm iso(that’s the key, warm iso from 20secs in the microwave). I guarantee I can clean, dry and reassemble my two DV’s faster then it takes to use an ultrasonic cleaner. Don’t forget you have to setup, warm up, use, let cool down and store that ultrasonic cleaner. Now if I waited for ALL my vape parts to get dirty enough to clean everything at once, maybe but that will never happen in reality. Keep in mind I have two Hornady ultrasonic cleaners in my downstairs bathroom I have thought about using many times, just not worth the hassle and mess to me.