I have switched.
I use to just kind of brush the big stuff off and put them in. Thinking the bloom would protect them.
I no longer do that. However, if I have a broody hen sit on them I do not monkey with them.
After the school they convinced me to wash and disinfect them. I am still waiting to see if it will affect the hatch rate as of right now it does not appear too.
Their theory which I now buy is why put something that is not sterile in the incubator. Even if the bloom does protect the egg, how much can it protect it. I sterilize the incubator, I wash the eggs in 115 degree water, run the water over them from the faucet. I have an on demand tankless water heater. I can adjust the temps by a remote control. So I know exactly what the water temp is.
After the first rinse, I do not scrape anything as I do not want to put a scratch in the egg shell, I dip the eggs in a solution of one ounce of chlorine to 1 gallon of water. I then lightly clean the egg with a soft cloth. I then rinse again in a second solution of the same strength. I rinse and set them in sterilized racks to dry.
When I touch the eggs I wear latex gloves, A new pair each time I touch something non-sterile. I never touch the eggs with my bare hands until the chick hatches and I take it out of the hatcher.
I incubate in a separate room from the hatchers. I use 3 foam incubators I am using for hatching right now. I sterilize them between uses.
I do have chicks in the same area as the hatchers, that will end this year. I plan to build 2 cabinet hatchers for next year. Each will be in its own room, I will try to keep as clean as possible, sterile is hard to do with the room. With 2 hatchers I should be able to sterilize between batches.The incubators will be going into one larger easier to keep sterile area. I have 2 sportsmans I use for incubating right now. I may try to build my own next year. I will see how the time goes.
I like the sterile incubators, they smell better. ( I know dumb reason but lack of smell should be lack of germs).
This is what the state wants so I will do it. My only concern is chicks that have no immunity, but I assume they can get that later.
I have only been doing this for 6 weeks, so far I am happy with the results. Time will tell.