Question: how to remove grass stains from clothes
Option 0: Soak the stain for 15 minutes in a solution of two parts water to one part bleach.    Take a clean white rag and gently dab the stain.    Wash the stained pants or top with an enzyme-based laundry detergent. The enzymes will help lift the protein off the fabric.
Option 1: Soak the stain for 15 minutes in a solution of two parts water to one part white vinegar.    Take a clean white rag and gently dab the stain.    Wash the stained pants or top with an enzyme-based laundry detergent. The enzymes will help lift the protein off the fabric.
Answer: 1