Good day good people!

So...root mealybugs...persistent and stubborn little creatures aren't they...atm I even like mosquitos more...

I have this problem for months now,and did research and took advices from other people,but they keep coming back no matter what I do...

I treated the plants with soap,alcohol,hot water,24h water dipping,neem,homemade insecticides and pesticides...you name it...and they still keep coming back or not leaving at all :D

Ofc I change the potting mix and the pots before repotting ( which leaves me with a lot of potting mix to throw away ).

So...how long would I need to bake the mix in order to get rid of the bugs and larva? Would you even recommend it? Should I treat the plants with something else? Should I do the drench with some neem or so?

Many thanks in advance!!! I really appreciate your opinion.