I have never ever in my vaping cartomizer life cleaned one. Well, I just worked this clear dual of it's base and unwrapped it and rinsed everything out (including the coils) and dried it in paper towels and put the thing back together and it's good as new. Took less than 5 minutes. There was a little bit of gunk on the coil wraps, but not one spot on the filler. The filler rinsed clean (I used the filtered part of my tap) and was white as snow. The gunk was easily scraped off with my thumb nail. Yes, they ARE made of awesome.
I heard this was possible on Kickbassvapor's forum with the clear duals. I guess boB sleeps with his PV and he did it accidental like. I am waiting for a video review to show someone cleaning these.
I wanted to try this, but I am greedy and won't take apart a perfectly good carto. None of mine have gone bad yet (three vapors using them for four days). If I ever burn one or it goes south for any reason, I will then do a post-mortem.
But yes, they are true awesome at 3.7v. After using one, I ordered ten clear, ten 1.5 ohm, and ten 1.25 ohm. I can't really tell any difference between the three. However, there is a huge difference between these and LR cartos (and LR atty's). I don't want to use anything else. I just fill them in the morning (one for each flavor) and done. I have used my 1.5 with BWB Applewood for a week (main flavor). It just keeps going. It took over 50 drops to fill the first time. Now 15-20 drops every morning. I top off a KBV Butter Rum Pecan Ice Cream, and a Jooglar's Clint Vapewood. Nothing but vaping bliss! (I just got some AV Gorilla Juice in, so I may have to carry another dual coil carto).
To summarize, I feel like vaping just went from 8-track to CDs. Now we just need to get a smaller, lighter, longer lasting battery to put these on.
edit: to take these apart (clear ones only), rock the plastic back and forth to seperate from the threaded end.