1. Remove the hard skin from the roots of the asparagus stems, soak them in salt water for about ten minutes, then take them out and rinse them with water before using them in cooking.

2. You can also mix baking soda and water evenly, then soak the asparagus for about fifteen minutes, then take it out and rinse it with water for cooking.

3. You can also use rice washing water to soak the asparagus in the rice washing water, soak it for about 10 minutes, then rinse it with clean water before cooking.