Pad..I'm so sorry about your bug problem. Mealybug is the worse of all pests.
Normally, wiping leaves off using Q-tips or Cotton balls dipped in Rubbing Alcohol clears them up, but if all your plants are infested, it's going to be a big job.
You mentioned insectidal soap helping. How many times did you use? The bottle should state the number of times to use.
I normally spray plants with organic stuff around the house but have yet to come up with something that rids mealy.
One suggestion would be to spray with Fish Emulsion and Rubbing Alcohol. 1 capful of FE to a 16 oz mister. And 1/4 teas of RA. Mix thoroughly.
Now that springs here, can you place plants back outside? It'd be easier spraying plants while outdoors.
I'm really not into chemical insecticides, but if your plants are truly infested, you may need to use something more than FE and RA.
How many plants do you have? Toni
PS, if any plants are w/o mealy, isolate at once.

Thank you very much. When I found out that these bugs were mealy bugs, I applied rubbing alcohol on these plants, wherever I saw them. I have 5 plants, each in 3 gal containers. I agree with you, it is a big job. I sprayed the insecticidal soap two times so far. I moved the containers outdoors couple of weeks ago. I will try your idea of FE and RA. I hope I can get rid of them completely before they damage my plants and before I move them back inside in winter.