iOS 7 and App Cache

I found an awesome desktop application called PhoneClean that lets you selectively delete app caches! It's free and super awesome.

But... don't u think there should be a built-in way for users to manage app cache? As I keep using Facebook and Twitter the amount of app caches can easily add up to 1GB in a number of weeks. For an average user it's also confusing what's taking up so much space in their Usage statistics.

The thing is, I remember that one time when the remaining space was very low, iOS 7 automatically deleted app caches. Like it showed "Deleting" below the app icon. Don't really know how to trigger that, because it isn't very consistent. Have u experienced this before?