How to clear app cache of delete app data on your iPhone

Many iOS users are completely unaware of this trick, so I thought I'd share this. Open the app that you want to clear cache.
Press the power button until you reach the point that it says 'slide to power off'.
Then, hold the home button until it kicks you off the app, approximately 8 seconds.

That's it.

You can go to Settings > General > Usage and check the specific app and you'll notice that it deletes the cache.