Years ago, I had carpenter ants and the exterminator put liquid insecticide in the walls. Don't remember what it was, but likely banned these days.
I've been using bifenthrin as an outdoor perimeter spray. Should I inject something inside the walls. I don't want to use something repellant if what I need is bait. And I certainly don't want to poison myself.
What's current DIY practice for carpenter ants in homes? At this point, I'm thinking more prevention than cure.