When I do a dry burn, I disassemble the head down to the main coiled wick, leaving it in as if normal operation. (Cap off, flavor wick out, etc).
Put it on a VV if you have one, and turn it all the way down, and pulse it (no more than 3 seconds at a time, too long and it will potentially pop the coil!!!) until you see the coils begin to glow ever so slightly. few more short pulses, and all done.
You can do this with a normal Triton batt if that's all you have, just make sure to keep an eye on the coil as you warm it up... as soon as it starts to glow, stop firing it, then repeat until the gunk and whatnot is gone.
Reassemble, load, and vape on!
HTH!