Removing bloodstains from carpet is possible. Two methods effectively remove both fresh- and dried-blood stains. The first approach blots the stain with cold water and chemicals, such as ammonia and dishwashing detergent. For a more natural approach, use cold water only, says Good Housekeeping.
In both applications, one should gently blot the stain repeatedly with a clean, white cloth to lift the blood, rather than rubbing, which only deepens the stain into the carpet fibers. Applying the cleaning solution from the outer edge of the stain toward the center helps to avoid spreading. Other effective home remedies include a cold-water paste of baking soda, meat tenderizer, salt or hydrogen peroxide. Oriental rugs and antique rugs containing silk or part silk require professional cleaning.