How to Delete Entire Photo Stream in iOS 6

Question

Here's how to delete and reset the entire Photo Stream in iOS 6.
WARNING: This will delete all 1000 photos in your Stream so make sure you're ready to do this (by backing them up).
Delete the Photo Stream
Note: You cannot have your device hooked up to a PC or Mac during this procedure.
In Settings, select "Photos & Camera" (in the left column on iPad).
(On the right in iPad) move the slider for "My Photo Stream" to Off.
It will ask you if you want to keep or delete your photos. Choose Delete.
If you're doing this on multiple devices, make sure to complete these three steps on each device before continuing.
You have successfully turned off and deleted the Photo Stream, but you're not done. Now you need to reset the Photos app so that it won't re-download the photos from iCloud if you choose to turn Photo Stream back on.
Reset Photos App
Launch the multi-tasking App Tray. On most devices, press the home button twice.
Remove the Photos app from the App Tray, by holding down the Photos icon until the red X appears on the icon.
Press the red X. The icon will disappear from the App Tray.
You're done! Now, you may launch the Photos app from the home screen if you wish.
Turn Photo Stream Back On (Optional)
If you want to use the Photo Stream feature for future photos, you may turn the Photo Stream feature back on.
In Settings, select "Photos & Camera" (in the left column on iPad).
(On the right in iPad) move the slider for "My Photo Stream" to On.

Answer 1

I haven't done it in a while but you may want to connect the phone to your Mac and open Image Capture on the Mac. I don't remember that it allows deleting by folder but if not it still would be faster than doing it one by one on the phone. The delete icon is at the lower left (red circle with line through it).