I'm curious as to how you guys clean your ce2's. I wash the wicks in hot tap water,then burn the wicks dry with a lighter. I do a dry burn lasy, maybe 3-5, 5 second burns. Just curios about your method, as I had an atty die tonight, and when I took it apart, the coil was a solid clump of black coal. I've been vaping 60% vg blend lately, and wonder if that was the culprit. I clean my attys, every tank full, which is approx 6 ml.
I also rinse with water but dry burn on the battery. I try to do this when I detect a change in flavor or see my juice turn darker. That will usually avoid the black clump and the dry burn will be easier.