Wiping memory on broken phone with no display
I recently dropped my iphone 4 in water. It seems to work to some extent, but the display is shot. It basically looks blank although every once in a while you can see a little something if the light hits it just right. Anyway, I received a replacement phone and now I have to send the broken one back, but I would like to remove my data and restore it to original settings before I mail it. Is there any way to do this without the display? I tried Find My iPhone in iCloud but it only finds the replacement phone. I think that when I activated the new phone, it made the old phone unable to be found.
iPhone 4