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You're absolutely right. I'm sorry, I should have clarified: I was talking about visibly clean eggs that are headed for the incubator. Eggs that have poop or worse on them, I either don't incubate or spot wash in warm to hot water. The sandpaper routine with the pea eggs was more along the lines of an experiment, sort of a "gee, I wonder how this works?" thing. It worked better than I expected. Did it remove all of the glop? No, hot soapy water would have done that job much better. But it did seem to remove enough to keep any bacterial growth to an acceptable level.
Eggs for eating, we generally wash. While I might put up with a few specks of dirt (not poo), my husband and the folks we give eggs to don't have to put up with dirty eggs.