I had a few causing me trouble last spring.  Gray squirrels in my case.  In the process of building, so I had not finished deck ceilings, and they got up in there and into the attached soffits.  A couple connibears with peanuts did the trick.  Got 3 within a few days and then the remainder cleared out as I put the ceilings up.  I basically worked them into a corner, if there were were any remaining so that they would have to exit through a trap.  They were all gone as I waited several days, then finished boarding it up.  No problems since (crossing fingers)
This was the first 2 I got, pretty quick
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Then I worked the ceiling down until I left only a couple openings for them to potentially get back out...and meet their maker, if there were any left.  No action for a few days, so good to go, and nothing since.
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