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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.
As previously mentioned, hot water and soap gets rid of ants fairly well so if you are lucky enough to find the ant nest or ant hole, pour some of that into it! Depending on the size of the nest, this can often kill the entire ant colony, including the queen ant which will ensure that the ants leave you in peace.