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Boiling or cooking a live seashell will loosen up any animal tissues inside the shell and make it easier to remove. You will need a pot and tweezers or some tool like a dental instrument to remove the animal tissue. To clean live shells by boiling:  Place the seashells in a large pot of room temperature water. Cover the shells with about 2 inches (5 cm) of extra water. It's important to use room temperature water and to put the shells in the pot before heating them up because any sudden heat could crack the shells. Bring the water to a boil. Let the water roll for about 5 minutes. If you are boiling more than one shell, add extra boiling time. As well, larger shells might require more boiling time. Take out the shells with tongs and place them gently on a soft surface like a hot towel. Carefully, with your tweezers or any other tool, pull out any animal tissue from inside the shells and dispose of it. This method of cleaning out a live shell can take the longest, but many choose to use this method to prevent the shell from being damaged. Boiling and freezing, as well as pulling out animal tissue by hand, can cause a shell to crack. Burying a live shell, provided you bury it in a safe place, protects it from damage and is a natural way to clean out animal tissues. Ants, bugs, and other insects will feed on the shell and clean it out. To clean live shells by burying them:  Dig a hole in the ground. Make sure the hole is large enough to fit all your shells and also provide plenty of space between each shell. The hole should also be around 18 to 24 inches (45 to 60 cm) deep to prevent unwanted animals from digging up your seashells or people from stepping on top and crushing your shells. Place your shells evenly with space between them in the hole. Cover the shells with dirt. Wait a few months for insects, larvae, worms, and bacteria to remove the tissue inside the shell. The longer you wait, the better the results.  Dig up the shells again and check to see if all signs of animal tissue are gone. Freezing kills any remaining animal tissue inside the shell and makes it easier to remove. To clean a live seashell by freezing:  Place your shells in a Ziplock bag. You may need to use several bags if you have many shells. Add water to the bag until all the shells are covered. Place the bag in the freezer. Let it freeze solid for a few days. Remove it from the freezer and let it thaw completely. Take out the shells and pull out the animal tissue from inside the shells.
Boil the shells to remove animal tissue. Bury your live shells. Freeze your live seashells.