1. Wash off the sediment on the shell of the flower shell with clear water. Then put the flower nail into a waterless wok and heat it for 3 minutes. When the flower nails are opened one after another, immediately pick out the opened flower nails and wash them under the faucet, so that the sediment inside can be cleaned.

2. If there is not much sand in the flower nail and there is time to treat it, it is suggested to put some salt in cold water, drop a few drops of sesame oil, then put the flower nail in and let it stand 1 hour, then stir it repeatedly and rinse it with clear water. Because the smell of salt and the fragrance of sesame oil will make the flower nail open, and then it will close after stirring, so that the sand inside will spit out as soon as it is opened and closed.

3. If the flower nail contains more sand, you can add a small bowl of vinegar in clear water and soak it for about 2 hours, so that the sand in the flower nail will basically be spit out.