In this article, I will give you the steps to clear the Tablet app cache whether you're using Android or iPad.
Open the tablet Settings on your device.
Head over to Apps Menu.
Choose Installed Applications.
Find the Application you want to Clear the App Data off.
Select it, and Move to the Storage Tab.
Hit Clear Storage/Clear App Data.
On your iPad, select Settings.
Select General > iPad Storage.
Depending on how much you have stored, it may take a few seconds to a couple of minutes for the iPad Storage page to load. Once it loads, you should see a breakdown of how your iPad storage is used and a Recommendations section.
Next, scroll through the list of apps and tap one to clear its app cache.