How do I uninstall Garry's Mod Completely?

[SuicidalNinjas]

How do I uninstall Garry's Mod properly? So that I start with a "vanilla copy" of Garry's Mod? This is to go with the progress of my other thread...

[tschumann]

Delete steamapps\<user>\garrysmod\

[Phishcook]

I might have to do this to, in relation to my thread