A WebmasterWorld thread has discussion around using the geographic target option in Google Webmasters Tools.
One interesting point brought up by Tedster was that when you use it, reversing it and reversing the effect can take a really long time.
Tedster said:
Another webmaster said he reversed it and the traffic never went back to normal. He said:
Do you have experience with setting up the geographic target and reversing it? If so, share your story.
Forum discussion at WebmasterWorld.
Image credit: Olivier Le Moal / ShutterStock.