Another ant control approach

Follow the ant line to its source.
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It might be a window, molding crevice or floor crack.
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Form a temporary barrier at the source with boric acid or laundry detergent in powder form.
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Remove any food the ants have attacked and discard it in a garbage can outside your house.
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If the ants have invaded the kitchen garbage can, bring it outside, hose it down and wash it with dishwashing liquid and water.
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Put food the ants have not found in zipper-lock plastic bags or in plastic containers with sealable lids.
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Or put these items in the refrigerator.
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Remember that ants can penetrate metal-threaded lids on glass jars.
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Seal these jars in zipper-lock plastic bags.
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Glass jars are immune from ants only when sealed with a rubber gasket.
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Seal all food items in your cupboards, especially sugar, honey, maple syrup, grains, cereals, cookies, jams and breads.
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Once you've secured the food, vacuum up the ant line, along with a bit of cornstarch, which helps suffocate them inside the bag.
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Or wash them away with dishwashing liquid, water and a rag if you prefer.
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Use dishwashing liquid and hot water to wash the area around the ant line and erase any scent of the trail.
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Seal the area where the ants entered; caulk windows and cracks and weather-strip doors
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Apply duct tape or petroleum jelly over holes as a temporary fix.
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Go outside and see if you can determine where the ants entered the house.
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If they used a branch as a bridge to the house, trim it.
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Check the area in an hour. If you see any single ants, or scouts, searching the area, squash them.
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They're scoping out the area for future invasions.
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If you wish to wipe out the ant population, use ant traps that contain boric acid.
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The returning ants poison the entire colony.
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Ants play a beneficial role in gardens, however, so only do this if absolutely necessary.