Using tongs and being careful not to burn yourself remove 1 shell and grasp with gloves or towel, so you don't burn yourself, and gently pull out the animal tissue inside. The time you cook your seashells can really vary by microwave so really just try it until you figure out how long to put them in for and then treat them just like you would in step 3. There is no set time to let them soak because it various by the type of seashells and quantity of seashells being cleaned. Just make sure to remove them after the periostracum is gone. The periostracum is the flaky leathery covering that covers most live seashells.
Fresh water -Remove from bleach and rinse thoroughly with fresh water.
If preferred you can rub the seashells with baby oil to give them a luster. If tissue should break off inside the seashells you are cleaning there are two ways to proceed. Shake the seashell vigorously trying to remove the extra tissue or sit it outside where flies, bugs and ants will crawl inside the seashells and remove any remaining tissue. This is the trap door of the shell that helps protect it from intruders. Sometimes on smaller seashells another method to remove the tissue is to squirt them with a water pick and the high pressure will push the tissue out.