Why do some detergents contain enzymes?

Soaps and ordinary detergents work well on grease but are not very efficient in removing things like dried blood, cooked egg stains, milk stains or other proteins that have SOLIDIFIED on the fabric. When we eat. digestive enzymes break down the food into simpler substances that will dissolve in water, The enzymes in detergents do the Same thing: they turn the proteins into substances, which dissolve in water. Enzymes used in detergents are manufactured on a large  scale using - microorganisms found in soil.