IPhone messages (saved) won't clear?

IMy iPhone Usage under settings says that my "messages (saved)" are taking up 1.5 GB of data. I don't see any kind of Delete button for it. So how do I clear this? Please help. I've rest my phone multiple times and have ios7

Texts can take up a lot of space. You can delete portions of a text conversation or entire threads at one time.
Once you do, you'll need to resync with iTunes or it will keep a backup of your phone before you cleaned all that stuff out of it.
Best luck.

http://ipod.about.com/od/phonefeatures/a/delete-iphone-sms-messages.htm

http://www.cultofmac.com/247043/how-to-delete-text-messages-from-your-iphone-in-ios-7-ios-tips/

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