2. Use iron. Put iron (such as scissors) into a container for clams. Shellfish have the habit of spitting mud when they smell iron. This can also make clams spit sand quickly and well.
3. Soak in sesame oil and salt water. If time permits, you can soak the clams in water with sesame oil and salt. One thing to note in this method is that the water temperature is preferably around 20 degrees Celsius. If you use tap water directly, the water temperature is low, and clams don't like to open their mouths. Soak for 2-3 hours like this, and the clams will spit out a lot of sediment.
4. shake back and forth. Find a big pot or box with a lid, put the shells in it, pour some water in it, and then shake the container back and forth with your hands, moderately, not too big, or the clam shell will break. After shaking for two minutes, the clam will faint and spit out a lot of sediment. Wash it with water, shake it again and repeat it three times.
5. drowning. This method is the most direct and thorough way to remove the sediment of clams, but if clams are used as soup, don't use this method, and the umami taste will be lost. You can use it if you fry clams. Put the clams in the boiling water pot, cover the lid and take them out after one minute. Rinse with water, thoroughly wash the mud in the clam, and drain the water for later use. In this way, the precipitate can be removed without reservation. A vendor selling clams at the seaside once told me that if you cool clams with boiled water, the sand will sink to the bottom and then wash them with the water above, so as to keep the clams delicious.