Google is great but there are some things that we would rather keep off their crawlers. Here are fome links that have helped us.
- Insert robots file. http://www.robotstxt.org/robotstxt.html
- Remove an unwanted URL using webmaster tools. https://www.google.com/webmasters/tools/removals
- Guide to remove content from all Google affiliated sites. https://support.google.com/legal/troubleshooter/1114905?rd=1