IPhone Apps - Data Cache

When I go the iphone menu:  Setting > General > Usage, I can see the size of each App.
Most apps are relatively small in size, but the Info & data size grows everyday as I use the apps.
example like Facebook, the FB app is only 14MB, but my data size is more than 1.4GB.
beside deleting the app & reinstalling, is there any way to reset this data? ... well - Apple only has a Delete button on that page.
I know deleting & reinstalling will bring the app back to 14MB, & there's no data lost on my FB page.  But this method is not so efficient when there are hundreds of apps' data cache to clear...
anyone has any idea how to clear this data cache for apps?

hi pvonk,
thanks for the pointer, I've tried that but it didn't clear the App data cache.

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