Method 1: put some salt and a few drops of sesame oil in tap water, put the clam in and let it stand for an hour, then stir it and repeat it several times. Principle: The fragrance of sesame oil and the taste of salt induce clams to open. When they are stirred, they are frightened and approach. As soon as they open and close, they are forced to spit out the mud.

Method 2: Soak in water and put a kitchen knife (or other iron tools) at the same time, the shellfish will spit out the sediment, which usually takes 2 ~ 3 hours.

You can also raise fresh shellfish in a basin, and then drop a little vegetable oil in the water to remove their mucus.