1. Soak the crab in light salt water, close it and spit out all the dirt, then pinch its back with your hands and hang it close to the edge of the plate so that the pair of pliers can just hold the string.

2. Scrub the whole body with a brush, and then hold the crab shell.

3. Open the crab navel with both pliers, squeeze the black line in the center of the navel cover from the tip of the navel, squeeze out the feces, and finally rinse it with water.