It’s summertime. An army of ants decided to invade your house. First reflex: running to the closest hardware store to buy the strongest insecticide for being sure to get rid of them. Next time reflex: squeeze a lemon, spread some juice where ants enter in your house. Let the peels not so far and observe what happens.
I adviced my grandmother to do so a few weeks ago and when I called her today, she was so happy to tell me that my tip worked good and that now, ants were going directly to the second floor of a residence and not anymore to a ground-floor apartment!!! ahahah!