After walking in the countryside and parks you are likely to find that the children’s clothes as well as yours have grass stains.
In light-colored clothes (overalls, jeans, mako t-shirts) this particular stain is more obvious than in dark ones.
Grass stains: removal
Always check the care label on the garment to know how to wash it. If the garment is marked dry clean only do not attempt to remove the stain yourself.
Some grass stains can be easily removed from certain fabrics with simple detergent. Pour a small amount onto the stain, scrub with an old toothbrush, then wash the garment in the washing machine.
Bleach is effective as long as you can use it on the garment with the grass stain. Otherwise, choose a mild bleach powder that you mix in warm water and soak the area of the garment with the stain.
As another solution, you can try to remove the stain with pure alcohol (but be careful not to discolor the garment). Do a test on a spot of it that won’t show even if it doesn’t fade, with a clean sponge dipped in a small amount of rubbing alcohol, then rub the stain. Rinse in cold water and allow the garment to dry naturally before washing in the washing machine.
If the stain persists, you can try vinegar. Soak the garment in hot vinegar and leave it for a few minutes. Scrub the stain with a brush, then wash as normal.
With information from thespruce.com