Get 4 or 5 of those black covered traps with the little bait cup in them. Fill it with peanut butter. Find the area of the most mouse [no swearing please] and place it there along the wall.Turn out the lights. Within 2 or 3 hrs those traps will be full. Lift open the black cover and drop them outside dead as a stump. Worked here got them just in time. I got two before they had the chance to see the results of their romantic time together and the rest of their family knew where they were at. Sealed up the tiny hole they came in and no more droppings and no more mice.