Time for a house clean, out with the old and in with the new.

TUs total kill history throughout WoW:

Old Lands
Molten Core - Cleared
Onyxia's Lair - Cleared
Black Wing Lair - Cleared
Zul'Gurub - Cleared
Azuregos - Killed
Lord Kazzak - Killed
Taerar - Killed
Ysondre - Killed
Emeriss - Killed
Lethon - Killed
Prince Thunderaan - Killed
Ruins of Ahn'Qiraj - Cleared
Temple of Ahn'Qiraj - Cleared
Naxxramas - Spider Wing - Cleared

Outlands
Karazhan - Cleared
Zul'Aman - Cleared
Gruul's Lair - Cleared
Magtheridon's Lair - Cleared
Doomwalker -
Doom Lord Kazzak -
Serpentshrine Cavern - Cleared
The Eye - Cleared
Mount Hyjal - 4/5
Black Temple - 1/5