I have done some experimenting and careful record keeping with washed vs. unwashed eggs (all from my own birds) and I've found that I get a consistently better hatching result with the washed ones. Then again, the one and only horrible rotten egg I've ever had was one that I'd washed, so who knows...
I rinse mine under a hot tap and rub to remover any dirt, then I dunk them in a hot dilute bleach solution for about 10-15 seconds. then I rinse off, again under hot running water and pat dry with kitchen towel. And after that I don't touch the eggs by hand until I'm candling at days 6, 12 and 18 (don't like candling and handling them with gloves on) and I make sure to scrub well with antibacterial soap before I go anywhere near them.
I rinse mine under a hot tap and rub to remover any dirt, then I dunk them in a hot dilute bleach solution for about 10-15 seconds. then I rinse off, again under hot running water and pat dry with kitchen towel. And after that I don't touch the eggs by hand until I'm candling at days 6, 12 and 18 (don't like candling and handling them with gloves on) and I make sure to scrub well with antibacterial soap before I go anywhere near them.