Any suggestion on how to keep squirrels from 'living' in your house. I work for an elderly lady, she lives in a very wealth neighborhood (so shooting them is out). The squirrels have gotten behind the 'flashing' around the roof over her sunroom and are chewing/have chewed throught to the attic. I think they are building nests up there. They are actually the between the ceiling and roof of the catherial ceilings in her living room. We can't run them out or trap them up there , to remove them. I placed two huge bars of moth-cakes in the 'run ways' but they only kept them at bay for a day. I placed a plastic owl out there, it kept them away for two days. I placed a trap in the attic area with peanut butter, haven't caught anything in two months. She is not out side at all and I don't go out much. She had no dogs/cats and there are non that are loose. We had a guy come last yr. and charge 300.00 to fix the screen on the ends. suggestions???