How to Remove Grass Stains From Clothing. A grass stain is considered a "dye stain," one of the hardest kinds to remove. Carefully follow each step - first testing the cleaning product on a hidden area of the garment - until the stain comes out. Then wash the garment according to the instructions on the label.
Sponge washable fabric with water. Then sponge the stain with rubbing alcohol and let it dry. Do not use alcohol on silk or wool. Dilute the alcohol a lot (three parts water to one part alcohol) for acetate.
Sponge with cool water, then work liquid detergent into the stained area. Rinse with water. Let dry.
If the stain remains, soak the fabric in a mixture of 1 qt. warm water and 1 tbsp. stain-removing enzyme product for 30 to 60 minutes. Rinse thoroughly and re-launder in hot water, with a bleach that's safe for the fabric.
Bleach with hydrogen peroxide as a last resort.
For best results, take the garment to the dry cleaners as soon as you can. Point out where the grass stains are.
If you need to remove the stain yourself, sponge with white vinegar, then water. If that doesn't do it, apply a paste of enzyme product ' but not to silk or wool. Leave on 30 minutes, then blot with a warm-water sponge.
Try applying a paste of baking soda and water to the stain. Work in a little white vinegar with a sponge. The bubbling of the chemical reaction may work to get the stain out.