module ActionController::Renderers

def self.remove(key)

ActionController::Renderers.remove(:csv)

To remove a csv renderer:

This method is the opposite of add method. 
def self.remove(key)
  RENDERERS.delete(key.to_sym)
  method_name = _render_with_renderer_method_name(key)
  remove_possible_method(method_name)
end