Okay, where to talk about this? Not in the health thread. Not in the gardening thread, since I'm only concerned with indoors in my own apartment.
I got ants again. The first 20 or so years I lived here, not one ant. Then one year they came in with a Doordash delivery, either from the restaurant or from the driver's car. I got rid of them pretty quickly with a mixture of honey, water and boric acid. There weren't that many of them.
This year, it seems my whole building is infested. Drought conditions have made it a bonanza year for ants. The only defense an ant in the wild doesn't have is against drowning, so somebody goes out and hoses down the steps and walkways every couple of days. If it rains, even better.
But they are little hitch hikers, coming in on the feet of people, their dogs and cats. Anyway, I had too many to get rid of easily. I'd think they were all gone, but then leave out a plate after lunch for a few minutes before cleaning up, and find the plate swarming with the little beasts. They got under my desk and climbed under my pants legs. They were on the bathroom floor. It made me cry. Is this life from now on? What to do?
Well, you have to bring them all out. All of you out here now! So I made a station in the kitchen, and a smaller one under my desk.
Just for this purpose I bought a package of Little Debbies strawberry shortcake rolls. I mushed one up with some borax (20 Mule Team, cheap in any grocery store), really mushed it together well, with wet hands, so the ants wouldn't be able to separate the food from the borax. It made like a playdough. I spread some out on a small area of the kitchen counter, and spread some on a small tupper lid under my desk.
Let it go. Don't kill them when you see them swarm the bait. They have to take it back to the nest to feed everybody. It took four days. I watched what was going on in the kitchen, couldn't tell so much about the trap under my desk, but I painted my feet and legs with cinnamon oil to keep them from trying to get on me.
So monitoring the kitchen trap, the first day a giant ant metropolis was going to and fro. You could see each one was carrying a teeny tiny dot of food back to the nest. The next day, less but still going strong. Third day, the herd was starting to thin out. Fourth day there were so many dead ants on the playdough, and so few staggering back to the nest, I doused the whole trap with dish detergent and washed the counter clean. You do have to drown the bait, in case some ants are still alive in it. I'm sure now that they are all gone. I removed the tupper lid under my desk, also covered with dead ants, washed that, and sprayed under my desk with peppermint essential oil.
The bathroom was easy, vinegar in a cheap plastic spray bottle, no time at all, but spraying every time I thought of it, and leaving it on the floor, not wiping it up.
I have painted my front and back door thresholds, and the kitchen window sill, with cinnamon oil to keep newcomers away.
I'm not as confident as I used to be about never having ants, but now I know what to do if I get them again, and won't let them drive me mad before taking action.