Shoutbox

Hi all
My first post is just asking if something is possible.
Is there a way of clearing a contact from my blocked list if they haven't deleted and blocked me? I ask people sometimes to delete and block me but they must only block me so i cannot permanently delete them. It is not that important but I like to keep things up to date neat and tidy lol. Any suggestions welcome. Or do I just have to wait till they delete and block me?
Thanks Paul