I don't wash my eggs in so far as scrubbing them but I do sanitize them with 1 oz of clorox to 2 gallons of warm water. Leave in there for 1 minute two minutes for soiled eggs. I found instructions on the instructions to my top hatch. They do not recommend sanitizing but I know that the big hatcheries do sanitize to minimize bacteria in those huge units they use. I have never always had good results.