Uninstall a Package Installed With Curl
You can uninstall meteor with the following commands
rm -rf ~/.meteor/sudo rm /usr/local/bin/meteor
Official instructions at https://github.com/meteor/meteor (search for uninstall)
You can remove a package from meteor project, either in command line or by deleting it from ./meteor/packages file.
So to remove iron:router just type in terminal:
meteor remove iron:router
Or find iron:router in your .meteor/packages file and simply delete it.