does anyone know what I can do against an ant infestation? for reference, they usually come in my appartment (at ground level) and swarm wherever a small crumb of food might fall on the ground. I tried to follow them to see what path they took, but I watched for 10 minutes and no path really emerged, they just carried the food to the wall and then nothing.

I tried spraying the general area where they came from with a commercial soap formula, as well as being very cautious about crumbs, but I always find one or two ants roaming about in the appartment. My theory is that they use the thin space between the wall and the floor to navigate around the house, but I don't know what to do to prevent them coming.

I'm going to contact my landlord to see if they can do something, but if anyone has an idea, please contact me.