I use a CE2 tank mod, and clean the wicks/coils with a propane torch and dry burns. They last a long long time, with cleaning every few days (I usually have around 4 tanks on the go). I vape around 6ml of 80pg 20vg homebrew per day, and some of my flavours really gunk up the wick in the coil. The torch burns this off and makes it shiny white again, even under the coil.
Edit: before I dry burn/torch, I run the carto through a vodka bath in a jewellery cleaner for 2 minutes or so to get all the juice off first.
Edit: before I dry burn/torch, I run the carto through a vodka bath in a jewellery cleaner for 2 minutes or so to get all the juice off first.