1. Apply toothpaste or detergent to the steamer, gently brush it with a toothbrush or steel ball, and then rinse it with clean water.
2. Soak the steamer with white vinegar or lemon juice, let it naturally undergo oxidation reaction, and then rinse it with clear water.
3. Soak the steamer with edible alkali or soda solution, let it decompose the pigment naturally, and then rinse it with clear water.
4. Boil the steamer with hot water, add proper amount of salt or vinegar, let it fade naturally, and then rinse it with clear water.