I just have to ask this because I just watched my broody lily hatch out her clutch of 4 eggs. She got 2 chicks. The nest wasn't all that clean. Other chickens were always getting in the nest and laying eggs and confusing Lily until I came to her rescue and put her back in her own nest. They got really dirty before they hatched, but still she got 50% hatch rate which is better than I've ever done in my bator. I clean my bator, disinfect it, tear in completely down like Miss Prissy says and still I get lousy hatches. I watch the temps, and Humidity and all is good. I do admit that this last hatch of my own eggs was a really clean hatch, no sticky gooy chicks so that was good. Are we all being over excessive in our cleaning? Is it really all that necessary if broody's can do it in way grosser conditions? I'm just wondering.