SOOOOIf you are reading things that say don't wash them you are reading the wrong things..
NPIP school will teach you to wash all eggs and why. If they are going into an incubator, you wash them. If they are going under a broody, you don't.
Washing eggs is one of those things I get persnickety about....
What is the best way to wash an egg for incubating? seems to be several ways