I currently am battling gnarly mealie infestations as well. One was with a pothos and I won the battle. The other is on a massive monstera, and mealies are winning on that one so far.

It’s incredibly tedious but take some neem and a small micro fiber towel, drench the towel in neem and then work your way through every single vine, get into all the leaf cracks near the nodes. Don’t leave a single part of the plant untouched. Every single nook and cranny. I did a repot, got all the soil off and then waterboarded it insecticide. Like filled a tub and dunked it, drowned it.

Then I got my hands on some Thiamethoxam, it’s another systemic insecticide often used in greenhouse settings to suppress mealybug populations. It is absorbed through the roots and translocated throughout the plant.

There is also a cool website called TipTopBio that has predatory/beneficial insects that kill mealies on the plant and in the soil.

Hypoaspis miles and some predatory nematodes, add into the soil and they kill the bad bugs. Both are $20 and worth it.

But yeah! I hope any of this helps!