Stains from milk are referred to as "animal stains." Milk is an animal-based substance, and when it is spilled or splattered on clothing or other materials, it can leave behind a stain. These stains are considered "animal stains" because they come from an animal-based product.
Vegetable stains, on the other hand, come from fruits, vegetables, and other plant-based substances. Mineral stains come from minerals, such as rust or hard water deposits, and grease stains come from oils and fats.
It is important to treat stains as soon as possible to increase the chances of removing them. For milk stains, it is recommended to first blot up any excess liquid, then pretreat the stain with a stain remover or laundry detergent before washing the item in the washing machine.