There are several scents and plants that can repel rats. Here are some of the most effective ones:

• Peppermint: Peppermint oil is said to deter rats from entering treated areas. In high concentrations, peppermint oil may exhibit some repellency. Many homeowners claim to have personally tested this multiple times.

• Ammonia: Ammonia is used as a rat deterrent because it mimics the scent given off by rat predators like cats.

• Eucalyptus: Rats are repelled by the smell of eucalyptus.

• Citronella: Rats avoided the food located in areas that were sprayed with citronella oil. The scent of citronella can also reduce their appetite.

• Sagebrush: The smell of sagebrush is effective at keeping rats away.

• Mint: Rats tend to shy away from mint and any other herbal aromas. Spearmint is also effective.

• Plants: Certain plants can serve as a repellent towards rodents as well. Planting these plants/trees in your yard will enforce your strategy in repelling rodents and prevents them from entering your home as well. The following are plants that repel rats from ever coming back again: mints, sagebrush, and eucalyptus.

Its important to note that while these scents and plants can help repel rats, the best way to prevent rat infestations is to eliminate their food, water, and shelter sources. Additionally, if you already have a rat infestation, its recommended to contact a professional pest control service for eradication.