You can usually clear an app's cache and data with your phone's Settings app. Settings can vary by phone • Clear cache: Deletes temporary data. Some apps may be slow the next time you open them. • Clear data storage: Permanently deletes all app data. Try to delete the data within the app first.

When you clear data of an app it resets the app to its default state like when you first installed it. Clearing data will delete all data associated with that app like a freshly installed app. Your login details , permissions and settings are erased.