Don't wash, at all.
In fact, am attempting to add more complex biodiverse bacterial load to our guts. We had been immunologically impaired from antibiotics, but have enjoyed more health in this past year than ever. Added Bubbie's sauerkraut, whole yogurts, pills of lactobacilli and other "probiotics". (I have brought home more salmonella, c.diff, enterococci, E.coli etc from work over the past 18 years, we were always sick with 'something').
Couldn't believe it, that adding germs would help so much. But there, it is.
Far less dangerous to eat germs from our own environment which we live and breathe in, than a multible antibiotic resistant germ from a factory.
It is SO reasurring to know if my kids lick the beater from cake batter or cookie dough made from our own eggs, they will probably not die (I poop test twice a year for pathogens which I may have brought home from working with sick people).
I know people get all hot-headed about bacteria and germs, please forgive me. I live on both sides of the issue.
Am blessed with chickens who lay tidy eggs, and only poop tidy poops, for the most part. Our girls forage through a suburban lot filled with grubs, dirt, ash, composting soil, weeds, lawn etc. I know I am lucky our eggs are not covered in poop, in fact they are pretty and clean.