Ah, the classic 'Aunt Flo left an unwelcome parting gift on the sofa' situation. It happens to the best of us. While the digital spirits in your provided links decided to ghost us with loading errors, fear not! I've got the lowdown on how to tackle that crimson crisis without having to flip the cushions over for the rest of eternity.
First and foremost, repeat after me: Cold water is my friend. Hot water is the mortal enemy of blood stains, as it will cook the proteins and set the stain permanently into the fabric fibers. We want to evict the stain, not make it a permanent resident. So, whatever you do, keep things chilly.
Your first move, especially if the stain is fresh, is to blot, not rub. Grab a clean cloth or paper towel and gently press on the area to absorb as much as you can. Once you've blotted up the excess, it's time for your cleaning concoction. A simple solution of cold water and a few drops of mild dish soap is often all you need. For a bit more power, you can create a paste of baking soda and cold water, apply it to the stain, and let it sit for about 30 minutes before dabbing it away.
Apply your chosen potion to a clean cloth, not directly to the sofa, and dab the stain from the outside in to prevent it from spreading. Be patient; this may take a few rounds of dabbing and blotting. Once the stain has vanished, use a new cloth dampened with only cold water to "rinse" the area and remove any residue. Pat it dry with a clean towel, and let the air do the rest. Soon, your sofa will be back to its pristine, non-crime-scene self.
