Allow adsense despite Googlebot settings in robots.txt

To display adsense despite User-agent: Googlebot settings in robots.txt
add this to robots.txt after Googlebot settings:

User-agent: Mediapartners-Google
Disallow:
Allow: /*

Some sites argue that you should use
User-agent: Mediapartners-Google*
but it's not recognised by Google webmaster tools.

Perhaps using both could be an option ?