Hey, I tried something new to clean the flavors out of my atty (I didn't have any gunk, just flavor build up). I tried running water through, I tried soaking in coke, I tried just letting them drain overnight. I decided to try something different and soaked my atty in VG. I have a set of 901 round carts wish soft silicone caps, and I took and put one on one end poured in VG, and put one on the other and let it sit for a couple of days. When I drained it back out I got out lots of the berry juice I'd used(I'd been vaping a fruit punch with pom in it so it was red and therefore noticeable). Now that atty works almost as good as new. This would prob also work fine with just putting it in a glass or something and pouring VG over it and letting it soak.