1, just stained with tomato juice, you can use salt on the stain (so that tomato juice adsorbed on it), dipped in water to moisten, wash with soap.
2, has dried tomato juice, rubbed with vinegar, left for 5 minutes and then wash with water.
3, baking soda dissolved in water and rubbed directly.
4, white fabrics can be soaked in bleach solution (3% to 5% sodium hypochlorite solution) for 1-2 hours and then rinsed with water.