I found plenty of different entries on Google about deleting GRUB/GRUB2 and just wanna get all the reliable ones here! In one easy to find space.
I know GRUB is an amazing piece of tech, but sometimes it is useful to know how to delete it.
In your posts, please include
1. The tool/command you use
2. How to use it
3. If its netbook compatible (AKA USB compatible)
I'm going to start the list
Super Grub Disk
You need to get the 'outdated' one. Burn it to a CD or use UNetbootin (USB compatible) to make it from the select distro section.
Boot into it, and the most reliable way is to change the language, choose English (or whatever you speak), Windows and then Fix Windows Boot
This is probably the most user friendly way to unistall GRUB, but I may be wrong!