I've had really good luck with an ultra sonic jewelry cleaner and a food dehydrator.
I boil mine for 15 minutes on top of the stove to start, rinse and sling.
Then here's what I do pertaining to the jewelry cleaner:
Get some water almost to boiling.
Sling out as much water/
juice out of the cartomizer that you can get out. Do it into a sink.
Rinse under hot water and sling again. Do this a couple times.
Load cartomizers into the jewelry cleaner and add the hot water.
Cycle the jewelry cleaner 4-5 times (3 minutes each).
Drain off the water and refill.
Cycle 2 more times.
Drain water and carefully remove the cartomizers.
Rinse under hot water and sling them again to get as much water out as possible.
Now put them into a food dehydrator and set on high. My dehydrator has a top fan to circulate the air.
Leave for 12 hours.
Refill and
vape.
**If you have long cartomizers or jumbo's, drying time will vary.