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For many apps, an easier solution to clearing the cache is to log out of the app's account and then log in again.
 
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I use Tapatalk, the forum-browsing app, on both my iPhone and iPad to browse Forums (including this one!)

Tapatalk has a "Clear Cache" option in its settings that allows a user to clear the app's cache (mostly cached photos, videos and other similar media) and that will inevitably reduce the "size" of the app right down again.

So it is clearly possible on an iOS device, but just down to the relevant app's Developer to implement?
 
After reading this thread, I deleted my weather app and Dropbox, then reinstalled them. Got almost 1 GB of space back. Google + also has to be deleted often, if you use it a lot.
 
After reading this thread, I deleted my weather app and Dropbox, then reinstalled them. Got almost 1 GB of space back. Google + also has to be deleted often, if you use it a lot.

You should only have to log out and log in on the Dropbox and Google apps for their caches to clear.
 
iOS automatically clears app cache when you need more storage space. You shouldn't have to so it.
 
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