Delete all your posts in it.
If it's a RP thread or large discussion topic, best not to, since E does have a non-deletion policy, particularly if that deletion affects the continuity of a thread.
Adult socializing game posts or little "avatar above you games," things like that, those are probably okay so long as you're not deleting en masse
and its just a post or two. Deletions from a RP, PROC, On-topic, G&C, B&U, places of larger substance essentially--best to ask first.