how to get blood out of mattress, To effectively remove blood stains from a mattress, start by blotting the area with a clean cloth to absorb excess blood. Mix cold water with a mild detergent and gently dab the stain. For stubborn stains, create a paste with cornstarch and cold water, apply, and let it dry before brushing it off. Always test a small, inconspicuous area first. Remember, quick action is key to successfully removing blood from a mattress.