When I bought my S&B house 4 years ago, it had squirrels in the attic, and had for YEARS. I tried all of the remedies, trapping/relocation, closing up entrances, putting smelly things (e.g. mothballs). The only thing that worked was buying a pellet gun and shooting them. I started shooting every squirrel I saw in the yard. Within 2 months, I had all of the squirrels out of the attic. Since the smell of squirrel is in the attic though, it will still attract new residents, so I am still shooting them 2 years later. However, now I only see about 2 squirrels a month in my yard. That is amazing as I have a heavily wooded lot.