I've watched a couple of videos of making mortises.
What technique should I use to remove (bulk) waste from the hole without damaging the ends of the mortise hole? Clearly levering against them will bruise or dent the wood. I'm really looking for a technique which allows me to reliably clear the debris without risking damage. I'm especially looking for answers more specific than "be careful".
Edit: I'm not talking about the paring stage, I'm talking about bulk waste removal.