I don't have a dead j118 atty yet. My original very firstest atty did get clogged, and after reading the entire (yes, I know) atty care thread(s), the best cleaning method for me goes like this:
1) Soak atty in distilled white vinegar for two hours
2) Rinse off with cold water
3) Blow through liberally (or republicanly, your choice)
4) Dry with a blow dryer on low heat (or let it sit a long time if you are patient)
5) Drip a few drops of
juice (two or three) on the coil from the cart side
6) Put a fresh or just filled cart on the atomizer and stand it up allowing the atty to get
juice for 5-10 minutes.
7) Enjoy your death free nicotine