How to clear cache from iPhone apps?

Try Iclean Pro , phone must be JB

 

I delete the app and use Safari to go to website. Then I can clear Safari's web data in settings on occasion.

 

If you have an iPhone on iOS 8.3 or higher I don't believe you can anymore (believe Apple blocked access to app files). If you are on iOS 8.3 or higher you can always delete the app, restart your phone, then reinstall the app but thats sort of a pain.

If you are on iOS 8.2 or below you can simply use an app like battery doctor or a computer program like PhoneClean to delete the junk files on your phone taking up space.

 

Simply delete the app and then install it again and that should clear the cache for that app.

 

Restore from iTunes and every app will be cleaned. I always gain 3-5GB.

 

You can try an app called Battery Doctor to clean cache. There's also an option to clear RAM memory but that's unnecessary.