1)Open the Settings menu either through your notification shade (drop-down) or through the Settings app in your app drawer.
2)Navigate down to “Apps”. This may be renamed to something like Applications or Application Manager in OEM skinned versions of Android 6.0.
3)Once in there, click on an application.
4)You’ll now see a list of stuff that gives you information about the app, including Storage, Permissions, Memory Use, and more. These are all clickable items. You’ll want to click on Storage.
5)You should now clearly see the Clear Data and Clear Cache buttons for the application.