If you want to remove textures "unseen by the player" you need this little tool:
Newskip
Just use the Skip Textures on "unseen" brushes and compile your map to bsp and then use
the newskip tool to remove all "Skip-textures"
Newskip
Just use the Skip Textures on "unseen" brushes and compile your map to bsp and then use
the newskip tool to remove all "Skip-textures"