If it's muddy, my chickens get their eggs filthy. If they're muddy or poopy when I collect them, I'll put the eggs in very warm water for about 3 minutes to loosen the crud. Then, I barely touch them to clean the mud off under very warm water. I do not scrub them at all. I leave them on the counter for a few days before refrigerating. I heard somewhere that you shouldn't put them straight into the fridge, but I've never read or heard that confirmed anywhere. I just do that out of convenience.
A friend of mine is a compulsive cleaner and can't stand for anything to be dirty. Her neighbor would give her eggs and she soaked them in the sink in bleach water before refrigerating. Knowing what I know now, I can't imagine what those eggs must have tasted like. Blech.