Just to let ya know... I wound up having to wash each chick (to varying degrees) because they were pretty gummy after they hatched. Whenever they dried on their own, their down was all hard and stuck together in spots. This last chick even had a piece of the shell membrane stuck to its wing, which had dried into a very hard chunk! It also had a lot of blood on the top of its head that was difficult to get off.
I used a few drops of Ivory liquid dish washing soap and some lukewarm water, and scrubbed lightly with my fingers until it came off (being extrememly careful NOT to get soapy water over its tiny beak or in its eyes). Maybe a momma hen helps to clean up her chicks when left to brood them herself, or else the humidity issues in my 'bator is wreaking havoc with the process. I just thought I'd share this info in case someone else has similar problems...