Block Entry Points to your home: Locate all cracks, crevices, and holes that are entry points into your home. You can block these by using heavy-gauge material, concrete, and sheet metal to cover. Don’t use wood and soft metals as they can gnaw through also.
Hygiene and Sanitation: Remove any rubbish, use a tight-fitting lid on your rubbish bin, and don’t leave food out overnight.
Other Tips: Limit moisture sources and don’t leave cluttered items such as boxes etc in ceilings/garages/sheds instead use airtight containers.
Mice can have up to 60 babies per year and rats up to 40 per year. Unfortunately, these types of infestations, is why you need mice and rat exterminator.