It's quite the deal, I just seen a couple weeks ago on HOW IT"S MADE, they showed what the eggs go through. It was pretty cool. It's on the Science Channel
I do wash mine with water just so I can put them in the fridge in cartons before I sell them. I have 4 buckets so I wait for them to all fill, and leave them on the counter at room tempature. If they are really dirty I put a little vinegar in the water.