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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.
Spray it directly onto the ants to kill them, then wipe up the ants using a damp paper towel and discard them. 1  You can also use vinegar and water as a deterrent; spray it around your windowsills, doorways and other places where you see ants coming inside.