1. Method 1: If the mussels are in shells, brush the outer shell; if the mussels are not in shells, put a handful of salt inside the mussel meat; then wash it with your hands ; A lot of slippery stuff can be washed out in one go; and then it can be washed clean by running it through the same clean water.
2. Method 2: Use clean water to wash off the mud on the mussels, use steel wool to brush off hair-like things on the mussels, and then soak them in water for a while. Put the mussels in cold water, add onion and ginger slices, and bring to a boil over high heat. When you see that the mussel shells have opened, you can turn off the heat. Dip some ginger vinegar and you can clean it quickly.