Simply boil the seashells in the water for 3 minutes, then allow the water to cool before extracting the seashells from the water. Then, remove the animal tissue with tweezers. Even if you are indifferent about killing a simple organism living within a seashell, you could still contribute to disrupting an ecosystem which is something that you dont want to do. Some sites will tell you to bury them or freeze them. This method is also highly effective in getting rid of the smells and leftover materials from the previous owners. Take some warm water and rinse the shells properly before letting them dry on a towel. Take out the shells with tongs and place them gently on a soft surface like a hot towel. Wash produce in the water and peroxide mixture, rinse thoroughly with clean water and dry. This recipe will easily remove pee stains from a mattress. If you are collecting seashells from along the beach, it's important to clean the shells on the outside and inside and polish them to preserve them. Dig up the shells again and check to see if all signs of animal tissue are gone. One of the most popular methods for cleaning seashells is to simply boil them in water. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/0\/09\/Clean-and-Polish-Seashells-Step-1-Version-3.jpg\/v4-460px-Clean-and-Polish-Seashells-Step-1-Version-3.jpg","bigUrl":"\/images\/thumb\/0\/09\/Clean-and-Polish-Seashells-Step-1-Version-3.jpg\/aid1402105-v4-728px-Clean-and-Polish-Seashells-Step-1-Version-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"