Blood  

Fast fix: If the stain is wet, soak the fabric in cold water, then rub with a bar of soap.

Home remedy: If the stain is still wet, soak in water and apply a small amount of ammonia with a Q-tip. If it’s a light-colored material, “you can follow up by dabbing with hydrogen peroxide, which creates a powerful bleach,” says Steve Boorstein, the author and founder of ClothingDoctor.com. Machine wash. With dried bloodstains, apply an enzyme prewash product or soak the clothing in warm water with an enzyme detergent before laundering. If the stain persists, wash with a detergent and a bleach that are safe for the fabric.