sattec, thanks to your crest method, i've brought back several 510 attys from gunk-hell. this has worked really well so far. Post-crest-post-wash wicks are not brown anymore, airflow is close to new.
dvap: I am thinking its a surfactant, and this is what is doing the cleaning. which means maybe a dish-washing liquid/water bath might work too, especially a "degreaser". Maybe one of the "orange" cleaners, of course followed by either PGA or lots of hot water. Don't run out and try this folks, its just conjecture, and I take no responsibility if bad flavors remain in the atty.
This problem of gunked-up attys, I have found, is mainly with those that I vape tobacco juices with. Somewhere here (searched and searched, but couldn't find) was a simple statement from TropicalBob: tobacco juices are particularly high in particles. This may be the black pieces. So I am dedicating a few of my attys to tobacco flavors only.
My hot water follow-up wash was actually from my showerhead on low and set to a focused stream. Not too much pressure, as I dont want to disconnect anything inside. A minute of this removed all traces of mint.
I then flick most of the water out. I then dry off the atty with a paper towel, including inside by rolling up a corner and making a loose paper-towel "shaft" to push down inside. This get most of the remaining water. Then I do that again with the paper towel shaft with the atty on the batt, and activate the batt. This gets the water warm and the shaft wicks it from the inside of the atty. Then I put the atty to my lips and fire it up and pull over and over, like the depriming routine. If there is still water the gas will expand naturally into the mouth. I then prime with four drops of juice and vape as usual. Generally takes a few drags to get rid of the little bit of water and get normal vapor.
Of course, this is if I want that atty on line NOW. Otherwise drying overnight is fine.
I noticed that the full improvement from the crest wash is sometimes actually not immediate, but delayed for several carts-worth of vaping. Like further vaping continues the cleaning.
Topal used to put out a smokers stain-removal mouthwash. Can't find it now, but perhaps an anti-stain mouthwash would also work. I bought the crest health-pro, since I found no anti-stain washes, but it seems this might work too, since there are ingredients that supposedly remove tar stains. Just a thought.
Also, I think any cart/juice combo that works to keep the atty bridge from being starved will help keep them from getting hot without juice, which would further thicken the gunk. So keep those attys hissing and unflooded! The auto-drip mod I'm using now is allowing me to vape all day without ever having to blow the atty out, and this is keeping me from having to clean them as much.
Thanks so much sattec!!