Natural rat deterrents include high concentrations of peppermint or other essential oils. In addition, keeping areas prone to rat infestation clean and free of garbage and food scraps make these areas less attractive to rats and other rodents.
A very high concentration of peppermint oil is necessary when using it as a natural rat deterrent. While it may make for a natural alternative to traditional rat repellent techniques, in high concentrations, peppermint oil often emits an odor that is unpleasant to homeowners.
As rats need food to sustain themselves, they thrive in areas where garbage, food crumbs and residue are present. Keeping trash tightly sealed can also act as an effective rat deterrent.