Though everyone has their preference, including either rebuilding or buying new coils, what I do if the coil is usable is allow hot water to trickle over it for 3-5 minutes. A small trickle, not wide open. Throw the loose flavor wick on top away, there's no cleaning of that. If a flavor wick on top is desired, one can buy braided silica or regular wicking material. The braided holds together better than the standard, which if not careful, easily separates & goes everywhere.
Normally I have scrap ekowool silica wicking material from rebuilding coils to use for this purpose.
I then lay the rinsed coils on it's side on a box beside the exhaust vent of my notebook for 2 days, this allows the warm air to flow through it & it drys throughly. Just rinsing & turning upside down won't let the wick dry & the first few draws will be nasty. Plus a dried coil will absorb the new e-juice better.
Of course, it's best to use a similar flavor when reusing, being sure to put a couple of drops of e-juice on the coil before replacing the stem & gasket. Note that some types of e-juice flavors won't rinse out, in spite of the best efforts & it's best to use the same type. I don't want my coffee e-juice to taste like pina colada.
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