App Downloading at a Different Size than App Store says I have a problem with my Facebook app where the App Store says it's supposed to be 59.6 MB but when it downloads (and I haven't open it yet), it's 167 MB. 

Ironically, I wrote a blog post about how apps like Facebook and Messenger cache images and posts, which takes up space, and can only be stopped (without jailbreaking) by deleting and reinstalling the app. This is because when you delete the app, it also deletes 'Documents and Data' (including cached data).

I conclude that for whatever reason, the cached data is not being deleted, but I could be wrong.

Does anybody know how to fix this?
For some time now, iOS automatically clears app caches when your iPhone storage approaches full.



For this reason, there is little need to interfere by cleaning the caches manually. However, if you still want to clear the caches yourself, there are apps on the App Store that offer this functionality. 'Battery Doctor' (free) is one example - it offers many maintenance tools, including the option to delete 'junk data' from your phone