Many of the eggs I received to put in the bator were pretty dirty (dropping smears as well as dirty hay stuck like glue to the shell that I couldn't get off). I am down to 4 eggs left (day 17) out of 11 shipped eggs. I was just looking them over and realized that the eggs that were clean are what I have left. The two eggs with embryos that had late deaths were pretty dirty, the other 5 were very early deaths (blood rings or just a small blood spot in the yolk). Could the dirty eggs be the problem with how many eggs I have left? How much does a clean egg shell really play in hatch rate?