Prepare your mist: In a spray bottle, combine about ten drops of peppermint essential oil with one cup of water. Shake the bottle well to blend everything. Spray this solution around the drains of your sink, shower, and toilet every day to seal off any potential access points that roaches may use. Consistently repeating this method will keep the barrier effective. Cockroaches will eventually avoid sewers because they smell like peppermint, which is very unpleasant for them.
Additional measures to prevent cockroach infestation include:
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