Clearing all the app data on an Android tablet without using factory reset?

In Android, is there a way to clear all the app data at the same time without using the factory reset? I work at a library and we have Android Tablets for checkout for patrons to use and after the patron is done using the tablet we want to delete the username off any and all apps the patron may have used so that their username is not left on the app. I know the "Clear Data" button in Application Manager will clear the username but we would have to do this for every app and would rather do this in one instance rather then one at a time. Any help will be greatly appreciated.