Mice can cause damage in the home through their chewing, tunneling in insulation, and by spoiling food. It is estimated that a mouse contaminates 10x the food that they actually consume.
Some of the signs of mice in your home include dark droppings measuring about a quarter of an inch; footprints and tail marks on dusty surfaces; wet and dry urine stains; visible gnawing on doors, ledges, and walls; and the sounds of rustling and squeaks in walls. Don't let the signs go left unattended, otherwise additional mice damage with occur.
Mice also have a characteristic musky odor that can be characterized as a nuisance or problem.
Signs of mouse activity are:
Droppings - Especially near shelter, feeding areas and runways. Mice droppings are easy to spot on window ledges, kitchen counters, under furniture cushins, drawers, or under the sink.
Tracks - Foot and tail marks in dusty areas.
Runways - Tunneling in attic insulation (looks like Swiss Cheese)
Sounds - Gnawing, light running, and squeaking in ceilings.
Rub marks - Along walls, entrances and frequently used areas.
Gnawing - Chew marks on structures or food items.
Nests - Consisting of fine shredded materials.