Are you sure it's squirrels and not coons ?
If so get a Hav-a-hart live trap and a license to use it . Tree rats are suckers for peanut butter . Homemade deadfall traps work well too , as do wire snares if legal .
If it's coons see if your town allows archery hunting for nuisance critters inside the town limits and start pounding them .
Don't do anything illegal .