Results from this study indicate that properly washed clean or dirty eggs hatch as well as unwashed eggs.

What happens when eggs are washed?

Washing dirty eggs removes the bloom and invites bacteria to be drawn inside the egg. And washing eggs in cool water actually creates a vacuum, pulling unwanted bacteria inside even faster. ... (Of course, not all bacteria is bad, but you never know what may be lurking on the outside, so better safe than sorry.)

Can damaged eggs hatch?

If you do receive a cracked egg in posted hatching eggs and it's an expensive or rare then you can try to hatch it, but beware of bacterial explosion and the good possibility of ruining other eggs. It is possible to hatch a cracked egg by sealing the crack with candle wax/crayon wax or finger nail polish.