Couple of things you can do.
1. Go to the google webmaster tools, add the site by the IP, then exclude all the results in the index.
http://www.google.com/webmasters/tools/
2. You can use mod_rewrite to create a custom robots.txt file so you can exclude all search engines when crawling the IP. Here's a handy group of tip sheets on mod_rewrite:
http://www.ilovejackdaniels.com/chea...e-cheat-sheet/