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.
Use RIT whitener or another dye remover/stripper to bleach stains out and put those chemical brighteners back in. This process dyes a fabric white again.
Don't use alkalis such as ammonia, degreasers or alkaline detergents on grass stains. They interact with the grass and can permanently set the stain. On some fabrics, a grass stain cannot be removed, not even by the dry cleaner. Chlorine bleach may change the color of the garment or cause irreversible damage. Check for colorfastness before using. If the stain does not come out within 15 minutes of bleaching, it cannot be removed by bleaching. To check for colorfastness to liquid chlorine bleach, mix 1 tbsp. bleach with 1/4 c. water. Put a drop of this solution on a hidden seam or pocket edge inside the garment. Let it stand 2 minutes, then blot dry. If there is no color change, it's safe to use the product. Powdered bleaches have directions for colorfastness tests.