I have never seen a hen wash an egg. I have seen plenty of hens set muddy, (which means they got WET and muddy) eggs and have a terrible hatch rate. When you give away eggs, it is bad enough to send "junk eggs" but if you are selling, you should expect clean, decent eggs. If you can't provide, just communicate and say it's too muddy right now, no clean eggs available, show the muddy ones and see if the buyer is happy with that before you send.
Anyone here want to pay full price for my marans eggs that get poop all over them, or slightly dinged in my pocket, or that the hens were mud wrasslin' before they decided to lay that day?
I will be setting the other eggs I received today in a separate incubator so as to not contaminate them with these. I have contacted the seller and stated I was disappointed with the condition of the eggs. I hope they offer to refund. I will set these anyway but away from the other eggs as I said and hope they don't explode and stink my house.