I see no reason to clean eggs... much controversy on that subject, here. If the eggs look clean, I put them in a carton for sale. If they are dirty, I wipe them off with a paper towel, and either sell them, or eat them. If you keep your coop clean, and have plenty of clean, nesting material in your nest boxes- I doubt you will have much trouble with "dirty" eggs. Washing the "bloom" off the egg, reduces its shelf life.