Egg washing effectively sanitizes hatching eggs if proper equipment is available to do the job correctly. However, washing can cause contamination of eggs if the water temperature drops below recommended levels or if contamination exceeds the capacity of the disinfectant in a reservoir-type or immersion washer. The washing solution must contain a detergent-sanitizer. A washer that does not recirculate water is recommended. Immersion time should not exceed 3 minutes, and eggs should be thoroughly dry before they are put in cases.
Several disinfectants are safe for hatching-egg disinfection.
University of California research has shown quaternary ammonium to be an excellent sanitizer for hatching eggs. Leaves residual protection on eggs. Is safe for equipment and personnel. Is reasonable in cost. Is compatible with antibiotic dipping of eggs since it is safe to use as a disinfectant in dipping solutions.