You can dip a towel in water and detergent first, and then wash it with water. Soda powder can also be sold in supermarkets or grocery stores. There is a kind of baking powder, which can be stained with salt (let the juice adsorb on it, then soak it in water and wash it with soap, so that the tea can be eliminated.

The clothes were stained with tea stains. If it's just dyeing, 70~80 will do. C is removed by hot water washing. If it is an old stain, it should be soaked in strong salt water.

But you can't soak in colored rice washing water to prevent coloring. Yellowing silk clothes can also be rinsed with lemon juice or light citric acid to remove yellow stains, and finally rinsed with clear water.