Peppermint oil is known to repel several pests, including mice, insects, and ants. The strong scent of peppermint oil is overwhelming and confusing to mice, which can deter them from entering your house. Insects and rodents smell receptors pick up on the compounds found in peppermint oil and are repelled effectively. Peppermint oil can be used in several ways to repel pests, such as on cotton balls, in a spray bottle, or as a diffuser. However, it should be noted that peppermint oil is not a standalone solution and should be part of a holistic approach to pest management.