The cache data you want to clear is collected by your iPhones Safari web browser. Once in the Setting app, scroll down to the list of installed apps, then find Safari and tap on it.

You can manually delete app data on your iPhone to free up storage space when you're running low. Here's how to do it.

On iPad and iPhone, it’s very easy to do. Clear only some history items If you don’t want to wipe out your entire web browsing history, you can delete just the last hour, day, or two days.