Last summer, we had a chipmunk make a home in the wall of our summer cabin. We went to the local ACE to ask what to put in there to drive him out. It was WAY at the top of a 16' ladder to get to the opening. They said put in mothballs. Well, my wife must have bought 25# of mothballs. I put a lot in there.
Fast forward. At the beginning of this spring, I got on climbing gear and went up and put sheet metal over three or four holes. No more chipmunks. Now only the scent of mothballs.
How long does it take for mothballs to quit stinking? When we go up to the cabin, you can smell it when you first walk in. Then, I guess you get used to it or it anesthetizes your nose.
I have thought of pulling a couple of boards (not an easy thing) to get to the mothballs, but am not sure I could get to them all even then.
Steve