How to clear the app cache & data
- Open the Settings of your phone.
Tap the Storage heading to open its settings page.
if your phone runs Android Oreo or earlier, you'll want to open the App Manager settings page.
- Tap the Other Apps heading to see a list of your installed apps.
Find the application you want to clear the cache of and tap its listing.
- Tap the Clear cache button and also the Clear storage button.
The next time you use the app, it will download everything it needs from the internet like it did the first time you used it. Warning: This will clear all of the data, including usernames and passwords, etc.