The best way to get rid of white flies in houseplants?

Question

I have been using insecticidal soap but it hasn’t touched them.

Answer 1

Sticky traps may be the best method. You can also place the plant in a plastic garbage bag with the sticky trap for a few hours. This should help you get them under control.

https://www.gardeningknowhow.com/plant-problems/pests/insects/control-whiteflies-houseplants.htm