Remove/Reset Login screen message

Recently, I wanted to put a message on my Login (not Lock Screen) screen and I did it with the following command:

sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Message"

It took some time to appear for some reason but now I've been trying to remove that message for a while using the same command but leaving the "Message" part like "", as you can see in the following example:

sudo defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText ""

Yet, it does not disappear. Still there. How can I force my Mac to remove it?

You can reset a preference using defaults delete:

sudo defaults delete /Library/Preferences/com.apple.loginwindow LoginwindowText