When we bought our current house 11 years ago, squirrels had been living in the attic for YEARS. I finally bought a very high quality pellet rifle. (I wanted accuracy.) I am up to over 500 squirrels now. No squirrels in the attic for years now. (I am now down to less than $1 per squirrel.) But, I still have squirrels in the yard. You will never eliminate them.