Thread:Sannse/@comment-2003555-20150915181158/@comment-8-20150916172155

You can't clear it, but the oldest messages will automatically stop showing there. And you can tell if there are new messages because they are bold and have a summary on them.

Message Walls just aren't designed to be cleaned off in the way you are wanting. They are a record of old conversations as well as a place for new ones. I'm afraid you'll have to just ignore those messages you aren't interested in any more, they will soon be paginated anyway