Hi, I used to deal with squirrels a lot, in the situation you are describing I think your only option would be to trap them and then kill them humanely, they are very easy to trap, just remember to check traps regularly and its a good idea to keep the traps covered in case it rains, I hate the thought of trapped animals being left out in the rain with no protection. bait the traps with cut up apples, any fruit will do but apples are usually easier to obtain and cheap.