Washing store-bought eggs again at home can work against the safety measures already in place. Cold water may cause the contents inside the shell to contract slightly, which can encourage moisture and bacteria on the surface to move through the tiny pores. Soap should also be avoided because eggshells are porous and can absorb unwanted residues. For most commercially packaged eggs, the safest choice is to leave them unwashed and place them directly into the refrigerator after purchase.
Egg-handling practices differ in many European countries, where eggs are often sold without being commercially washed. Since their natural bloom remains intact, they may be stored at room temperature for a limited period under appropriate conditions. Farm-fresh eggs may also keep this protective coating. If one is visibly dirty and truly needs cleaning, it should be rinsed gently with water warmer than the egg, dried immediately, and refrigerated promptly. Once the bloom has been washed away, the egg should be handled like a commercially cleaned egg and kept cold.
For everyday grocery-store eggs, keep them in their original carton and store them on a middle or lower refrigerator shelf rather than in the door, where temperatures change more often. Inspect the shells for cracks and cook the eggs properly before eating. Although washing may seem like an added step toward cleanliness, it usually provides no benefit for commercially sold eggs. Understanding how they are processed makes the safest routine surprisingly simple: refrigerate them promptly and leave the washing to the producer.
