I deleted and reinstalled a game on iOS. The app still knows my account name.
According to another question there are no leftovers when an app is deleted.
How it is possible that the app still knows my previous login name? How can I make it forget it?
Note: it's a gamecenter app. I also accepted the option to remove it from the gamecenter.
My device runs iOS 6.0.1 and is not jailbroken.