Ants are attracted to locations by the way they smell. The scent of sugar is an especially powerful attractant. Spilled sugar or sugary crumbs will attract ants, even if those crumbs are too small to be seen by a human. Cleanliness is essential for driving away ants.
Ants also use the sense of smell to track each other. There scent is acidic. An alkaline substance will neutralize their scent. This is why the heavy chalk line worked - chalk is calcium carbonate, which is an alkaline material. Strong detergents are also alkaline. Use lots of strong detergent (un-scented) to clean the kitchen, pantry, and any area where food is eaten (and crumbs are dropped). This should drive those insects away.
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