I usually soak mine in 100% isopropyl alcohol for 24 to 48 hours. I think you can only get 70% from the stores.
I have tried combinations of iso alcohol and distilled white vinegar as well. Then if they are still gummed up I give them two or three minute boil in a water and citric acid bath. I use about two table spoons of powdered citric acid in the bath with only about an inch or two of water in the pot. If after all this, they are still gunked up, I go to the super heating method and rinse again.
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May your e-Cig always have one more vape left in it.
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