When I try delete the files directly from the workshop folder on my computer, they are downloaded again when I start up Portal 2? How do I delete them permanently? They are taking up 5GB of space!
I'm going to use the answer found on a steam community form found HERE
First, unsubscribe from the addon. It'll keep Steam from re-downloading the mod every time you start the game.
Then you'll want to follow this file path:
[Drive you have Steam installed on] > Program Files or Program Files (x86)* > Steam > steamapps > common > left 4 dead 2 > left4dead2 > addons > workshop.
Most mods are packaged in a file with a .vpk suffix. Find the .vpk file you want to remove, delete it, and voila. It's gone. This last step may be a bit hard if you have multiple Workshop mods as Workshop mods are numerically named.
Side Note: The addons folder where the workshop folder is located is where you paste .vpk addons you download manually to install them.
*Steam should be in Program Files if you have a 32-bit OS, or Program Files (x86) if you have a 64-bit OS. If it's not in one, check the other.
If that doesn't work HERE is another solution to remove workshop items:
open a shell and go to maps/workshop then type
dir /S/O/B *.bsp >doit.bat dir /S/O/B *.jpg >>doit.bat notepad doit.bat find and replace .bsp to .bsp" find and replace .jpg to .jpg" find and replace C: to copy null "C: save and exit notepad generate a file with no content named null start doit.bat
all jpg and bsp files are changed to zero filesize