To remove grass stains, soak the stain in detergent, rub the fabric together, and scrub it using an old toothbrush. Blot the stain with diluted white vinegar or ammonia to remove the rest of the stain. You can also use denatured alcohol to get rid of grass stain remains.
To get rid of red wine stains, coat the stain with salt as soon as possible, and leave it there to absorb the wine. Add some enzyme detergent to cold water, place the clothing piece in the water, and leave it for the night. You can also blot the stain with club soda after the salt absorbs the stain if you can't soak the garment in detergent right away.
To remove chocolate stains, leave the chocolate to harden, and scrub it off the fabric. Soak a light-colored cloth in colorless dishwashing soap and water, and apply it to the stain. After that, blot the stain with a little ammonia if it is milk chocolate. If the stain is dark chocolate, use two tablespoons of white vinegar for colors or hydrogen peroxide for whites. If the stain is still there, soak the garment in a mixture of 1 tablespoon of enzyme laundry detergent and 2 cups of water for 20 minutes.