To remove blood stains from carpet:

1) If the blood stain you’re trying to remove is dry, go ahead and brush it with a steel brush to loosen the stain. This action will remove the surface deposit.
2) Mix one teaspoon of hand dishwashing detergent with two cups of cold water.
3) Take a clean, white cloth and dip it in the detergent solution you just mixed.
4) Blot directly on the blood stain, repeatedly.
5) Repeat steps 3 and 4 until the stain has disappeared.