Here's the short lesson on bloodstain removal: act fast. Carpets today usually include stain-resistant treatments, so even blood can be removed if you get it right away. The longer the delay, the more difficult removing there are no carpets yet, and any carpet stain becomes. With blood, the process of coagulation makes it particularly hard to get the stain out if it's old and dried.
Step-By-Step Blood Stain Removal
1. Rinse and extract the blood stain with water. Apply just a little at a time, so you don't spread the stain. The stain can be set by hot water, which makes it permanent, so use cold water. Add the water, then blot it up with paper towels or a clean white cloth. You can suck on the solution out using a shop-vac, which means less of a possibility of spreading the stain.
2. Eliminate the stain with a solution of a few drops of Dawn dishwashing detergent in a cup of cold water. Work it into the bloodstain, but take care not to spread the stain. Blot the area with paper towels or clean cotton cloth, as this may damage the fibers but do not rub the stain. Fibers that are damaged hold stains and get stained in the future more easily.
3. Repeat the procedure as many times as is necessary, or until there's no more transfer of the stain from the carpet to the fabric or paper towels. Then blot up excess water when you're done.
4. Leave the fan blowing to dry it. Otherwise, place a stack of paper towels (white) on the stained area, or a few clean white cotton fabrics, and put something heavy on them. Leave this to blot up the liquid, replacing the paper or fabric towels as necessary. Fast-drying retains any remaining stain deeper in the carpet from"wicking up" to the surface and becoming visible again.
Some have reported good luck using club soda to remove blood stains, so if the instructions do not work, you can try that next. It's difficult to predict which will not and which spots will come out till you try. This is due to various types of other factors and carpet fibers. By way of instance, wool and other natural fibers are often more challenging to remove stains from. As with all stains, use water before attempting solvents.