If you're talking about webstorage saved data there's a clear local storage action for this.
If you're talking about resetting a single session you can write a simple refresh page javascript and call it through the callJS plugin (Maybe there's even a simpler way but here there are 40?C and my brain is melting <img src="smileys/smiley4.gif" border="0" align="middle" /> )
EDIT: Ashley knows a simpler way <img src="smileys/smiley36.gif" border="0" align="middle" /> <img src="smileys/smiley36.gif" border="0" align="middle" /> <img src="smileys/smiley36.gif" border="0" align="middle" />