Natural Rat Deterrent
Peppermint oil is said to deter rats from entering treated areas. In high concentrations, peppermint oil may exhibit some repellancy. The challenge with using essential oils as a repellant is they often are required to be maintained at such high concentrations as to be unrealistic or unpleasant for the homeowner to smell. Once the odor becomes acceptable to the person, it no longer repels the rodents. Secondly, a determined rodent will not be deterred by the odor.
The best natural rat deterrent is cleanliness. Food scraps are highly attractive to rats and garbage areas are often infested. Keeping trash sealed tightly and ensuring that no food crumbs or residue are available around your home can prevent rat infestations.
Although deterrents may prevent a rat infestation, eradication requires treatment. In the event of an existing infestation, contact your local pest control professional.