I have an Iphone 5s and it's out of storage space but I don't know why?

I've looked at my all my apps, music, ad pictures but it all doesn't add up. I connected it to itunes and the "other" part of the storage is almost 9gb. I e tried deleting everything and using a computer app to clean out space but nothing seems to be working. What can I do to get rid of the "other" part on my iphone? What should? Anything at this point would help a lot, so thank you in advance if you can help me!

The most effective remedy is restoring your phone to factory defaults, essentially wiping your phone clean of any data. Apps, music, pictures, contacts; all gone.

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