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Peppermint Oil: Highly effective in repelling pests, peppermint oil can be toxic to cockroaches. Add a few drops to your floor cleaning water, or soak cotton balls in peppermint oil and place them at insect entry points.
Eucalyptus Oil: While pleasant for humans, its scent is unbearable for insects. Use it for floor cleaning or mix with water to spray in corners of your home.
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