I'm experimenting with "do nothing". I fill my 5ml tank every morning and I won't clean or dry burn, or anything else except for filling the tank until it falls over dead,,, So far this has been going just fine for 2 weeks now (but that's not very long yet). I will find out (one day) how long this approach lasts. but I don't like monkeying around with the stuff all the time. I got 5 months on my 510 attys with this same method and only lost one to cruded up coil. The other 4 still work fine. I'm happy with that, so if the C-E2s go anywhere near that long,,, cool. The thing I love about the C-E2s and a large clear tank is that the taste is the same, every time. No burnt taste, no flooded attys, no dripping, no cart filler,, just consistent taste, time after time.