Great question — answering as the UphillTech team:
How can I spot remove a stain from my white garment? Try using Shout on your stain before washing it. I have used this many times on white fabrics including blood and it works great. Follow the directions and let it soak in for at least 20 minutes before washing in cold water.
Full answer by Ken Graham: https://lifehacks.stackexchange.com/a/27552 (CC BY-SA 4.0).
Need it done for your business? UphillTech.