Stain Guide Blood - Always read and follow the care instructions and any warnings on the garment label. And, follow these General Rules for stain removal. Treat blood stains immediately. Flush cold water through the stain and scrape off crusted material.
Heat can permanently set protein stains.
Rub gently from the back to loosen stain. Soak another 15 minutes in above mixture. Soak in enzyme product for at least 30 minutes. Soaked aged stains for several hours. If the blood stain is not completely removed by this process, wet the stain with hydrogen peroxide and a few drops of ammonia.