rvm remove is the preferred way of removing rubies from rvm.
By default, not only will it remove the ruby and it's source files, it will also get rid of aliases, wrappers, environments and any associated binaries - in other words, it cleans up most of the install.
rvm removeAs an example, to remove rubinius 1.0.0, you could do:
$ rvm remove rbx-1.0.0 info: Removing /Users/sutto/.rvm/src/rbx-1.0.0-20100514... info: Removing /Users/sutto/.rvm/rubies/rbx-1.0.0-20100514... info: Removing rbx-1.0.0-20100514 aliases... info: Removing rbx-1.0.0-20100514 wrappers... info: Removing rbx-1.0.0-20100514 environments... info: Removing rbx-1.0.0-20100514 binaries...
For the most basic case (e.g. you want to try clearing out a bad
install), rvm uninstall literally just removes the folder under
rvm uninstall VERSION_NUMBER
Casiano Rodriguez León 2015-06-18