I've set and hatched many washed eggs. The bloom gets rubbed off by mamma hen's belly when she sets on them and turns them, and my bator is a lot cleaner than the hen's nest. So I don't worry about that at all. If they're dirty, I wash them. BUT, if they're really filthy, like covered with mud and poo, I won't set them. I'll just choose cleaner eggs. (usually drier weather)
If you have a rare bird, though, and are desperate to hatch every egg you can, I'd suggest washing even the icky ones, and dip them in a 10% bleach solution, or a 3% hydrogen peroxide solution, diluted by half, (so it's really only 6%).
Commercial hatcheries wash and/or sanitize eggs before they incubate them. they would not do that if it prevented them from hatching.