The bloom gets rubbed off on the hen's belly anyway, I'd go ahead and wash the eggs, in warm water. I've done this and had them hatch just fine. With one bunch, they got washed multiple times, and hatched. The bacteria laden poop is a bigger threat to the embryos than soap and water. Poop contains not only bacteria, but digestive enzymes that can partially break down the shell, making it more susceptible to invasion by microbes.
I had to take one broody off the nest everyday like that, I only had to do it about 3 days before she caught on and got off on her own every day after that.