I'm interested to know the hatch rate without cleaning them, and how mama hen deals with the messWell, I'll leave everything as it is then, and I'll let you know the hatch rate in 20 days! The filthier eggs are 20% covered in yolk, which isn't too bad. I have the feeling that the hen will eventually clean the eggs herself by rubbing against them and turning them. I'll let you know how it goes.
The only time I had filthy eggs was when another broody ate one of her own eggs, but it happened at day 16th (blood and fluff everywhere) so very close to hatching day. I had 70% hatch rate that time.
