having worked in every aspect of poultry keeping over the years, from hatching to dispatching, i have learned many things to do with chicken.
it is not so much letting water into the egg, as washing off the protective coating on the shell and letting in bacteria such as salmonella.
when working as a hatchery operative, the eggs that went bad were the eggs that had been washed at the laying farms, ( blame that one on the government and MAFF at the time ) the eggs that hatched were never washed just gently rubbed to get off any muck....the laying farms use dry, fine, wet and dry paper to clean eggs.
As an operative we were allowed to go to the company's laying farms to see the eggs journey before they came to us, and every poultry farm was monitored as an experiment to see which farms had the better hatch rates.......we also had the opportunity to visit the growers farms to see what happened to our chicks once they had been sexed......please bear in mind we hatched hundreds of thousands of eggs per day......
the result of the experiment was that eggs from farms that had a washery installed were the eggs that went bad and had a hatch rate of 26%, those that did not have a washery were hatching at 98%, the figures speak for themselves......
now that is figures for hatching eggs, eggs for the table are slightly different, but i would not recommend washing them at all, even if they are eaten within 24 hours of laying.......after all you do not eat the shell, but if you are concerned about hygene keep them away from any food sources, in a basket for eggs ( after all we all know, dont we, that eggs should not be kept in the fridge ) ..