Prepare a big basin, pour crabs and 45-degree warm water into the basin, and the height of water should not exceed that of crabs. Then, take out the toothbrush prepared in advance, grasp both sides of the hairy crab with your hands, and then vigorously clean the crab's back, abdomen and mouth with your toothbrush. After that, clean the sides of the hairy crab and the roots of the feet and pliers with a brush. The next step is to open the belly cover of the crab and squeeze the excrement out from the middle. Then clean the belly cover and crab claws of hairy crabs with a toothbrush, and then rinse them with running water. Put the freshly washed crabs into a basin filled with clear water, and then soak them in it for about ten minutes. Then take it out of the basin and rinse it again with water, so that the dirty water brought in when washing crabs can be washed away.