If you see mouse droppings, or a mouse, it is time to take action: Trap, Block, & Clean Up.
Trap: Set up traps inside. If you are uncertain where your mice may be, focus on warm areas, like under the refrigerator where the compressor keeps the area warm.
Block: Try to block mice from getting in. This may be a huge task in some New England homes, especially those with older foundations, stone foundations, or porches and decks you cannot get under. Your foundation is your frontline. Filling mouse holes is like filling pot holes, it should be done regularly because rodents will make new openings and the expansion and contraction of buildings in the northeast climate can create openings, particularly where wood and cement or concrete meet (the foundation) or around door seals, such as garage door bases and trim seals.
Clean up: Clean up, carefully, by spraying the droppings with water, or a light soapy water (to keep dust down) and then pad the droppings up with a disposable paper towel or napkin. Please don’t vacuum rodent droppings since action may pull any harmful microorganisms into the air or onto other surfaces where they can cause an illness.