Reducing harborage area and eliminating conducive conditions is very effective in keeping rodents away! Trimming back all vegetation 1-2 feet away from perimeter of home; keeping garbage picked up around outside of home; eliminate piles of junk and debris outside of home, including picking up dog droppings; not leaving pet bowls of food outside; and making certain outside vents to crawlspace and outside attic vents are secure, will help greatly!