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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.
Baby Powder. A natural way to kill ants you see in your house is to dust them with baby powder. The powder will naturally remove the moisture that the ants need to move and to live. Baby powder also acts as a natural repellent to ants and spiders.