The most effective rodent repellent method is cleanliness. Most rodents are scavengers and will consume any food available to them. After locating a secure food source, rodents will nest within close proximity, and populations grow at rapid rates. It is important to store trash in tightly sealed containers and to dispose of garbage regularly. Coordinated effort with neighbors will help to further prevent rodent infestations.
Repellents may also be used to deter rodent populations. Both natural and chemical-based repellents are commercially available and vary in effectiveness. The smells of some plants, such as eucalyptus, wormwood and mint, are unattractive to rodents. However, they usually are minimally effective in repelling rodents.
Sound-based repellents are capable of emitting sound at a register too high for humans to recognize. These sounds are thought to be disconcerting to rodents and are intended to prevent them from infesting the area around them. However, sound-based repellents have shown limited effectiveness.
In the event of an infestation, contact your local pest control expert. Repelling rodents from certain areas within the home usually proves minimally effective, and the effect, if any, is localized and does not address entire populations. Professional, customized pest control solutions are often required in addition to repellent measures.