What I do with my newly shipped eggs, is to let them sit at room temp for 24 hours, 8 hours minimum before setting them in my incubator. They have been on a bumpy ride, so things are kinda mixed up in the eggs and need to settle before actually starting to develope.
I have a still air, so I set them at the coolest part of my incubator so they dont heat up too quickly and I do NOT turn them until after 24 hours. After 24 hours of setting, I move them to the center by the thermometer which reads 101.3, turn them more than 3 times a day and dry incubate until the 18th day when they go in lockdown. Then I raise the humidity to 60%.
Yes, you can definately wash them, but be very gentile as you could take the protective coating off. Cooler water seems to keep that coating on.
I have an excellent hatch rate. So I figured I would share my info with you. I hope it helps. Loool, my brother brought me several dozen eggs for eating, from one of his co workers. I cracked one open in the morning to cook, saw the bullseye, and realized they were fertile. I ended up setting all the eggs in the incubator and came out with many breeds of chickens including some very beautiful feather legged bantams! All the eggs I had set hatched. The lady that my bro bought the eggs from though it was impossible for them to even develop since they have been in cold refrigerator temps for a long period of time, hot weather and every possible thing that could cause an egg to not develop. Just gotta have faith. Eggs are quite forgiving, IF the parent stock are healthy, fed right, young, and have good genetics.