The coils are sitting by themselves surrounded by the interior metal walls and are made of a silica material,
due to that construction I think that they lend themselves to a standard dry burn to clean the coils.
I haven't tried it yet as I am still working on two Airs and bouncing between them for the past week
without a reduction in performance yet.
I have not dry burned one yet and did not stay at a Holiday inn last night, so YMMV...
I also was pretty unhappy at first with the burning in my throat when I started to use this tank,
turns out I was trying some new commercial e liquid and it was causing the discomfort.
Went back to my homemade and was in vape heaven!
Tried to rebuild coil in torn apart one, vertical with 28 gauge Kanthal approx. 9 wraps
and rayon wick wound around coil, then replaced liner material between inner and outer
layer. tests out at 1.4.
Seems to flood out so I cranked my iStick up to 20 watts, very warm vape and lots of vapor.
Will continue to play with it and will get pics when I can...