We can use cotton cloth dipped in alcohol to repeatedly wipe the ink of the black water-based pen on the clothes. We can also wet the clothes first, and then rub the ink with toothpaste repeatedly. We can also send the clothes to the laundry for treatment. In addition, directly bleaching or dyeing clothes can also remove and cover up ink. How to wash off the ink of the black water-based pen? If we accidentally get the ink of the black water-based pen on the clothes, we can prepare a piece of cotton cloth, soak it with alcohol, and then wipe the black water-based pen on the clothes repeatedly with cotton cloth to clean it.
Or we can soak the clothes in cold water first, then take out an appropriate amount of toothpaste and smear it on the place with ink on the clothes and rub it repeatedly. If there are still shallow ink marks, you need to wipe it with alcohol.
If we use the above methods but fail, we can try to send the clothes to the laundry for treatment. We can also bleach or re dye the clothes to cover the color of the ink.