Best way to COMPLETELY remove a jailbreak
Before iOS5 is released I plan to do a full wipe of my iPhone 4 and start a new, however, i have noticed that jailbreaks, even after Restores, tend to leave a little extra on the device. This "little" can slowly turn into a lot after multiple jailbreaks over time. In iTunes, my iPhone 4's Capacity is displayed as 13.4GB. Its a 16GB phone. Now I don't know if 2.5GB is being used by the iOS5 beta, but its kind of hard for me to believe that.
Does anyone know of a sure fire way to completely blast everything off of the iPhone and basically start stock fresh?