How to delete search history on new YouTube iPhone app?

Got the new iOS 6 update for my iPhone. The YouTube icon is no longer default, so you have to get the one from the App Store, which is quite different from the old one.

Whenever you click on the search icon it comes up with a list of your entire search history. How do you delete/clear your history? I don't have an account, in case that helps.

My new app clears it when I just go out of the app and click it again.

This is what works for me, if you close the app, then you have to close it properly. By double clicking the home button, holding down on the app and clicking the x. Then when you open it again, the search history is gone. Hope this helps:)