Last time I checked the small producer legislation, you were certainly not allowed to wash eggs for sale Bert. You were only allowed to pick off the worst of the muck. Effectively that means you can't sell dirty eggs as no-one will buy them. As said, the water must be hotter than the egg otherwise bacteria gets through the shell. Washing reduces the storage life because the natural surface sealing is washed off. We put a lot of effort into keeping the nest boxes clean and collecting eggs regularly, because a hen with dirty feet will step on eggs already in the box.