How to Delete Messages

How can I delete messages sent to me on GWM? Every one I have ever received is still there and I would like to delete a bunch of them. I have right clicked, left clicked and everything I can imagine to try with no luck. Thank you to anyone who can help.

There is currently no way to do this.

OK thanks Chainer.

To elaborate, the technical limitation is that the server only stores one copy of each message, and shows that one copy to both the sender and the recipient. If one person were able to delete the message, it would be deleted for the other person too.

This could be changed so that copies are stored instead, but this would be a somewhat involved amount of work for something I don't see as terribly important.