I used mosquito bits previously but have recently found a liquid source of BTI that is much more convenient since I don’t need to wait for the bits to soak.

I find bottom watering an impossible thing with the amount and size of plants I have so just adding the BTI during normal watering a few times past when you think you got them all, along with the sticky traps, should do the trick.

If you replant or add more soil I recommend starting another round of BTI right away for several waterings to prevent them from occuring again, since they seem to be prevalent in potting soil mixes.