Reddit reviews Safer's Insecticidal Soap: 500mL Concentrate
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I've been fighting them on my large Dracaena for over a year.
The 'cotton-swab with alochol' method will kill the ones you find, but if the plant is of any significant size, it's pretty unlikely you'll find all of them.
The best solution I found was to buy a bunch of insecticidal soap spray concentrate like this: https://www.amazon.com/Safers-Insecticidal-Soap-500mL-Concentrate/dp/B0002J9VAO/ref=sr_1_2?ie=UTF8&qid=1540950829&sr=8-2&keywords=insecticidal+soap+concentrate&dpID=3163103GJ4L&preST=_QL70_&dpSrc=srch
And a larger spray bottle like this: https://www.amazon.com/Solo-418-Ergonomic-Gardening-Fertilizing/dp/B000BX4VXI/ref=sr_1_10?s=lawn-garden&ie=UTF8&qid=1540950862&sr=1-10&keywords=pump+sprayer
Then mix up a bunch, and spray the plant down every two or three days, while occasionally rinsing it with regular water sprayings.
You'll need to do this for awhile because the eggs are not vulnerable to the spray, so you need to go through at least one entire lifecycle (probably a few to catch them all).
The reason you want to rinse with water occasionally is that otherwise the soap will accumulate on the plant, and after awhile the plant doesn't photosynthesize as well with the film all over it.
The method I described works best for plants that can tolerate a fair amount of spraying. Succulents and cacti will need to go with the alcohol swab method or you risk killing them by overwatering.