i'd probebly also look at filtering based on IP's as the adwords bot has been known to use IE and mozilla useragents (probebly in an attempt to catch ppl doing exactly what you're trying to do )
list of google ip's here - http://www.iplists.com/google.txt
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.