Clean nesting boxes make for pretty clean eggs. Unless they have mussy feet from the run.
I don't wash hatching eggs and I spot clean, only, eating eggs. I guess it depends what you want in the fridge. Personally, I don't like chicken poop in the fridge.
And there are limits to what I will put in the incubator, too.

I don't wash hatching eggs and I spot clean, only, eating eggs. I guess it depends what you want in the fridge. Personally, I don't like chicken poop in the fridge.
