Human: What is the best way to clean grass stains off my clothes? Assistant: 
The best way to clean grass stains off your clothes is to pre-treat the stain with a laundry detergent containing enzymes and then machine wash in cold water. You may also need to use a stain remover specifically designed to remove grass stains. Additionally, it is important to wash the clothing item promptly to avoid the grass stain setting into the fabric.