1. Soak the rattlesnake directly in clear water until it is completely soaked. Soak it for about 10 hours, change the water once, and soak it continuously for three to four days.

2. Soak the screw directly in hot water. At the beginning of soaking, change the water with warm water of about 50 degrees every three hours. When it softens, add hot water of about 90 degrees to soak for two to three days.