Chiming in here----
I usually blow my atomizers out every night and leave on a paper towel to drain. If one gets real stiff to pull/vape I will use Ever Clear, about 2ml and run it through a few times followed with very hot distilled water, about 2mls again. Do this a couple times and blow out as much as I can. Then shake a few times, hit the button once or twice, drip a few drops of liquid and good to go.
I have quit the soak, alcohol and all the other items I have read. This works for me and I only do it when the atomizer gets that hard to pull thing going on.