1. Keep Interior Rooms Clean to Eliminate Hiding Places
Do not leave food or piles of clothes in rooms. The kitchen should not have dirty dishes all over waiting to be cleaned. Same with mudrooms or washrooms, as these are the places that tend to become “garbage collections” and therefore easy pickings for mice or rats to make nesting spots.
The other areas to cover are holes in interior walls or baseboards where it is easy to get to insulation, another great rat nesting material.
If you hear sounds in your walls, like squeaks or scratching, it’s probably rats. There are natural deterrents and rat traps which are best if you have rats. Poison is not recommended, because if they die in your wall the smell and the cleanup would be a nightmare!