I just drop my coil head in a cup of hot water and let it soak overnight. Then I let it dry on a paper towel. I do this every couple of days before I get any burnt taste. Then I put the coil head on the base remove the chimney and attach it to my cheap ego battery and dry burn for a second til it glows. I leave the flavor wicks in place cause last time I removed them I lost them. I put a drop of e liquid on the wicks and let it soak in. Then I put the tank back together and vape on.
I had some juice that would burn quick in the iclear, but never had that problem with the protank.
I think the key is cleaning before its burnt.
I was thinking about that today; was dry burning my protank head and got to the point that it was glowing red; I really wasn't so sure I was going to see a red hot coil, but yep it's true; when the thing goes dry the coil can get red hot.
Then I read somewhere somebody cautioned about dry burning it might burn the grommet down at the bottom where the ends of the coil are compresseed between the grommet and metal; so I'm thinking it's important to stop the dry burning at the point where the coil starts to glow like you said.
By the way you might want to get yourself one of those bypass/passthrus like on my avatar especially for dryburning.