Daintie Delicates Period Panty Laundry Detergent - Liquid Formula for Blood Stains on Underwear – Gentle, Effective, and pH-Balanced – Pump Bottle (500ml) Enzyme Action: The detergent contains proteases, a type of enzyme that specifically targets protein-based stains. Blood contains proteins like hemoglobin, which are broken down by the proteases in your detergent. This enzymatic breakdown helps to dissolve the blood, making it easier to wash away from fabrics. Targeted Cleaning: By focusing on the protein component of blood, the detergent ensures that the stain is not just superficially cleaned but is broken down at a molecular level. This leads to more thorough cleaning and reduces the likelihood of residual stains. Effective Best in Cold/Luke Warm Water: The enzymes in our detergent achieve peak performance in luke warm 35 to 40° temperatures. However, it's important to note that blood stains can begin to set into fabric at temperatures above 42°C (104°F).