Mice are truly a nuisance! Teach resident to seal all their dry goods in plastic, air tight containers, take trash out daily, and make sure dust is removed. Place lots of traps along the baseboards, if possible. Mice are smart and will go around traps, so you need a lot of them. Make sure there are no dryer vents close to the ground (these make for easy access.) Clean the buildings ducts (mice like to build their nests in there.) Check the insulation in walls and attic areas because mice like to use these materials for nests, too. Finally, clear the outdoor areas of the buildings - are you close to open fields, farm land, parks, or other landfill types of places? You may have to try to treat the perimeter of the fields. Make sure your residents are not leaving pet food outside on the patio areas or in patio storage areas.