Deleting photos from iPhone 6
I have been using iCloud photo stream and photo library since I got my iPhone 6, but I've recently run out of space on my phone. I now want to delete all of the photos from my iPhone, and I already have backed up all of my photos onto iPhoto. When i sync my phone manually in iPhoto it gives me an option to delete all photos from my iPhone, but when I press it it doesn't do anything. I then tried to go into my phone settings in iTunes, and all it said is that my photos were stored in iCloud. When I log into my iCloud account it only gives me the option to delete them one by one. I have since turned off my iCloud photo stream and in iTunes it now offers me the option to manually select folders of photos to load onto my phone, but it still is not showing any way to delete all of the photos. Is there a way to mass delete photos? I have contacted Apple Care multiple times and they only told me to turn on Photo Optimization which is not the solution I'm looking for. Any help would be appreciated!
iPhone 6, iOS 8.4