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You don't need insecticides or ant traps to ant-proof your kitchen. Just give it the lemon treatment. First squirt some lemon juice on door thresholds and windowsills. Then squeeze lemon juice into any holes or cracks where the ants are getting in.
Ants also hate vinegar. For an easy solution, just mix equal parts of vinegar and water and then sprinkle on counters and other food storage and preparation areas. If there are no small children or pets in the house, you can also use glass cleaner to spray areas in other rooms outside of the kitchen.