Can't delete Gmod, what do?

So, I’ve been trying for days to delete Gmod so I can re-install it. Everytime I ‘‘delete local content’’ Steam either freezes or just doesn’t do anything.

Help is quite appreciated.

Manually delete your garrysmod content.gcf in your steamapps folder, and manually remove the garrysmod folder located in C:\Program Files (x86)\Steam\steamapps\YOURSTEAMNAME\

Also to be sure, delete ClientRegistry.blob from your main steam dir.

This should update steam fully and enable you to redownload gmod.

-snip- found it thanks!