after loging out my e-mail address still appears in facebook login page
I have updated my facebook app to ver. 38.0.0.6.79 (0), and now after loging out my e-mail address still appears in facebook login page. How can I remove my e-mail address, in order to have blank fields for user name and password every next time I run facebook.
iPhone 6 Plus, iOS 8.4.1