Keep the clothes dry, take the special washing liquid for hand washing directly on the stain and let it stand for 5 minutes. (If the stain is serious, use a soft brush to gently scrub the stain, or wipe the stain with a clean towel)
Put the clothes into the water with the washing liquid (excluding the amount of detergent used in the pre-coating), and knead gently.
After the stain is removed, rinse the clothes thoroughly with clean water and let them dry in a ventilated place.