1. First, put the crab in clear water for about 10 minutes, so that the crab can soak in the sand and become lively.

2. Use a brush or a small toothbrush to clean the crab's shell, abdomen and claws, especially in the armpits and abdominal ribs where there is more sand, so scrub it hard.

3. After cleaning, rinse the crabs with clear water for many times (usually 3-4 times) to ensure that there are no impurities such as sand and sediment on the crabs.

4. Finally, the washed crabs are soaked in clean water for 20-30 minutes, so that the crabs can digest the residual sediment and other impurities in the intestines and make the hairy crabs more pure and delicious.