Now this is going to sound really silly, but my duck eggs smell swampy and they lay with my chickens whose eggs smell fine. My kids dont want to eat them because of the smell. Let me rephrase, the shell smells swampy not the inside. Is there a way to clean them to get rid of the smell. I will be selling them soon and wouldnt want my customer to smell it when they open the carton. Where they lay is dry, but the eggs are always dirty and stinky....ideas? Water just doesnt work.