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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.
To keep ants out of your house, start by finding the place they use to come in. Try to seal any possible holes to keep the invasion at bay, and make sure there is no garbage or anything attractive to ants near the entrance of your home.