Non polar elements as carbon cannot be dissolved in water or anything else, imagine diamons (pure form of carbon) you cannot dissolve or soften diamonds or graphite etc. The strong ,very stable molecule bonds (very close to each other) don't allow liquid penetration. You cannot simply dissolve carbon.
I saw a research done and scientists dissolved carbon in chlorosulfonic acid, which will also DISSOLVE the cartomizer.....
Maybe sulfamic acid can be used diluted with water to slowly soften the carbon and form a colloidal suspension of carbon in the solution, then the solution can be discarded.
And all that IF those are carbon deposits (may be something else) on the nichrome wire coil. Nichrome wires can be cleaned with concentrated Hydrochloric acid without being destroyed or altered but this acid will damage the cartomizer and you would have to neutralize the acid with sodium bicarbonate (cooking soda).
DAMNED DIAMONDS!
DIAMONDS ARE FOREVER, BABY!
I've been treating the crud like it's burnt up sugars/food from baking (how would I clean my icky, crusty pans?)...is that carbon?
And you're right, water alone doesn't do anything to soften or dissolve it, or make it crack off, no matter how hot it gets. But is there anything safe that works like oven cleaner? That actually got the coil clean, even though I would never use something so toxic to actually clean my cartos. Only bringing this up because you're a mad genius, Konstantine!
Just to throw it out there, another thing about boiling in water is that the vinyl skin isn't rated to withstand that much heat. Typical vinyl can withstand 180-201 degF; boiling tap water = about 211 degF. That's why it shrinks and eventually peels off, which is OK if you reskin your cartos anyway. I personally don't like the ghetto-fabulous white lines that form when it shrinks, or the peeling corners. Plus, I think it causes major shrinkage on the filler, so eventually, the carto will only hold like 1/2 the juice...I still have a few of those...sucks to be poor...