Will Shortz's Squirrels

Every week, Will Shortz poses a puzzle to a live contestant on Weekend Edition. Then he proposes a listener challenge where the audience tries to guess the answer to his puzzle. The winner is next week's live contestant.

Usually, the Listener Challenges are puzzles, but two weeks ago, he leveraged his massive readership and asked for the best way to get rid of squirrels climbing into his attic. What was the winning answer? Click on last week's synopsis to find out.