How to delete my personal files retained by an app?
Apps store their data (including opened / downloaded / created files, databases, settings, caches etc.) in /data/data/&lt;pkg_name&gt;/ and /sdcard/Android/data/&lt;pkg_name&gt;/. It's not possible to delete files from former location without root access. So what you can do is either clear data of the app, or uninstall/reinstall the app in order to delete all files.