Egg under broody broke, how do I clean the eggs full of yolk?

[karlamaria]

I have a broody who broke an egg and it was all over her and the rest of the eggs, how do I clean the yolk off the eggs with out harming the egg? There only 3 days under her , I really want this batch to hatch ! Sand paper? Wet paper towel? Please tell me what to do as I heard the chicks can not get out with yolk on the eggs.

 

[five is my dog]

you could try sand paper but i would use a damp paper towel.