I don't know of any method to burn the crud of the coils in any cartomizer, particularly DC units. Though there is a tutorial posted somewhere on how to clean the single coil Echo by taking the packing out.
Errol
That would be correct. You can use the horizontal coil cartomizers over and over and dry burn the coils using this method. It's for the gogo but works just as well with the echo, echo-e and echo, dual coils. Good luck
http://www.e-cigarette-forum.com/forum/ego-type-models/188388-how-clean-rebuild-gogo-cartomizer.html