Proper way to remove MovieClips

I’ve seen a lot about removing movie clips and I finally want to settle this. What is the proper way to remove a Movie Clip from memory?

Right now what I’m doing is:

removeEventListener(Event.ENTER_FRAME, step);
this.parent.removeChild(this);

This is for an instance with 2 private variables and 2 methods (one of which is step). I saw some things about using something = null; and delete something; as well.