What is a one-sentence summary of the following article?
Once the stain has been saturated, there are a few different cleaners you can use to remove the blood from the couch. Here are some of the most popular blood cleaners for couches:  One part baking soda mixed with two parts water Fresh lemon juice mixed with a pinch of salt Hydrogen peroxide Rubbing alcohol (safe for S-only couches) One cup (235 ml) of cold water mixed with 2 teaspoons (10 ml) dishwashing liquid Hairspray Mix your cleaning solution in a bowl. Soak a clean cloth in the solution, and wring out the excess liquid. Blot the stained area with the cloth to saturate the stain with cleaner. Don’t rub the stain, as this could push the stain deeper into the material. Don’t be alarmed if the hydrogen peroxide starts to bubble and foam. That just means it’s killing bacteria. Use a fresh, dry cloth to blot the area and absorb excess cleaner and moistened blood. Continue dabbing a fresh area of cloth into the couch until the cloth comes away clean and dry. Continue alternating between dampening the area with cleaner and blotting it dry with a fresh cloth. Keep doing this until no more blood comes off on the dry cloth, and the stain is gone. For a blood stain that doesn’t want to come out, you may have to try a commercial upholstery cleaner. Saturate a clean cloth with the cleaner and blot the stain with the cloth. Then, blot the area with a dry cloth to remove blood and cleaner. Look for an enzyme-based cleaner that’s safe for use on couches. These types of cleaners are specifically designed to break down proteins in organic stains like blood. To rinse out excess cleaner from the couch, soak a clean cloth with cold water. Wring out the excess, and blot the couch to saturate the area with water. Switch to a dry cloth and blot the area to remove as much of the water and excess cleaner as possible. Let the area dry completely. To speed up drying, aim a fan at the wet spot. If you're working with an S-code couch, skip the rinsing step to prevent damaging the couch, and just blot the area with a dry cloth.

Summary:
Choose a cleaning solution. Blot the area with cleaner. Blot the area with a clean cloth. Repeat until the stain is gone. Tackle tough stains with upholstery cleaner. Rinse and dry the area.