Getting rid of mice is not easy. Mice entered your home because it’s cozy, have food and most of all are easy to get into. Contrary to what you see in cartoons like Tom & Jerry, mice don’t need a gaping half-circle of a hole in your baseboard. They can squeeze through tiny cracks, holes and gaps that are smaller than the circumference of your pinky finger. Basically, if you can fit a pencil into a hole, a mouse can probably fit, too. They are very skilled contortionists.
The first step is to inspect the outside of your home to find possible places mice can squeeze through. Check stairs, the foundation, corners and any place that might have small crevices. When you find anything that can possibly be an entryway, close it off with wire mesh. For inside the house, you can use steel wool and caulk to plug up any holes you can find.
Mice can chew through practically any material except steel. In my experience, using a wire mesh wherever possible has been most effective. You’ll need to do this for anything resembling a hole. That includes cracks and gaps along the ceiling and even those high up on a wall. Just assume that these tenacious creatures can reach anywhere in your house.