Ants from the house
I had the beasts in the kitchen for a week. They made it somehow through the front door into the kitchen. Cinnamon, and everything I had read and tried was in vain.
3 days ago, I had desperately sprayed the running tracks, door entrance and surfaces with Frosch Spiritus Glass Cleaner and also missed a spray dose to all the beasts I've seen until I discovered any more.
This then stopped for a full 24 hours. Then I had to repeat this again to prepare a few reluctant, who made themselves wide again, the Kehraus.
After that now for 26 hours absolute rest. If necessary, I repeat this one to two times. Was by far the most effective and at the same time cheapest.