Is there a plugin to handle unused blogs on multisite

Hi Guys,

Been looking for a plugin or similar to help clean up my multisite... I have a few users who create blogs then don't use them... is there an easy way to remove these ?? I am sure I have seen a plugin but cant find one now... I think there was one that after x amount of days inactivity an email was sent to the user then the blog was removed ???

Any thoughts guys would be great

Thank you