Mice and rats can be real pests sometimes. They are capable of destroying lots of things with their well known chewing habits and they leave their droppings wherever they go. There are several ways to get ride of mice. You can try using nautral things that deter them so that they will not want to come around your propery. There are some herbs and plants that they simply do not like.
You can also try trapping them in a live trap and taking them elsewhere to a more appropriate environment. If you do not mind to you can also put out traps that kill them or poisons that kill them. I recommend first trying methods that do not actaully hurt the mice. They are only creatures trying to survive the best way they can.