How do you remove packages already downloaded from the Assest Store?

I’ve downloaded a couple of packages of from the Asset Store, but how do i clear the list or delete the unwanted packages from the computer. Please help, thank you.

Depending on OS it may vary, here are all the locations if anyone stumbles here in the future

Windows 7, 8 :
C:\Users\UserName\AppData\Roaming\Unity\Asset Store

Windows XP :
C:\Documents and Settings\UserName\Application Data\Unity\Asset Store

On OSX: :
~/Library/Unity/Asset\ Store/

I think it is changed
C:\Users\userName\AppData\Roaming\Unity\Asset Store-x.x