QUESTIONS- Broken, stinky egg in bator!!

BLEH! My second dd yells that she can see one of the eggs in the bator is broken. So I figure we should candle the rest while we get rid of it.

So, do I do anything to clean the incubator? There is a drop of yuck on the metal wire and it is still pretty stinky. I ended up throwing 15 eggs that weren't good (almost all from the same batch-including the broken one). Will the chicks get sick from what is in there?

I also couldn't see how the red stars eggs were doing- 1/2 of the egg looked dark, I just can't see through the shell. The lighter eggs were quite amazing though- we could see those little babies in there (its day 6 for us). What can I do about the rs? Just cross my fingers?

Thanks all!