Clear Facebook Messenger App Cache Iphone. Tap edit > delete all to remove all the app’s data. Tap it and your data will be cleared immediately.
Open the facebook app on your iphone and go to app settings. If you clear data on facebook app, the application will reset and your facebook login will be removed from the app.the app will be like when you first installed it on your mobile phone. Would you like to delete cache on your facebook messenger app?