Grass stains can be stubborn. Here’s a couple of ways to remove grass stains with ease.
Rubbing Alcohol: Apply and let dry. Rinse. Rub with Tide liquid. Rinse and then launder as usual.
Pre-treat: Use white vinegar or Karo syrup. Rub it into the stain. Wash as usual.
Do not dry in dryer until stain is removed.
You can pre-treat with an enzyme laundry detergent (Biz or Wisk), or make a paste with water and a digestive enzyme capsule (opened to get the powder out) found at your local pharmacy or health food store. Apply the paste, let set for an hour and wash as usual, but air dry. Repeat if necessary.