sencha keeps session cookies from development version and compiles with ipa

I have an app that uses sencha stores for keeping a users session which is fine and works well but upon building for iOS i found that other users checking the app when passed the ipa were automatically logged in as me and also had access to my Facebook as it seeming has stored the session db from the emulator and packaged it with the app. How can I delete this session and ensure that the session is not passed in the ipa??