How to delete saved messages?

I have the iPhone 5 on iOS 7 and I'm all out of space. The reason being 5gb of saved messages. I have no messages in the app so how do i permanently delete those messages and open up some space?

A large number of message cache Image and videos take up most of the messages space. Just remove them, and you'll release almost all of the message space.
Or use the iPhone clean tool app to clean up them. Such as CleanMyPhone. Http://www.fireebok.com/cleanmyphone.html

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