Also check out our full review of Puracy Natural Laundry Stain Remover.
Promising review: “A tenant left some blood stains on this mattress and a heating pad about 20 years ago. They were totally dry when we found them. Not knowing what to do, we put the mattress aside for 20 years until we found this product. Tested on the pad first. I sprayed a whole bottle on the pad, left it in a bathtub all night. Then washed the pad in the tub. The pad looks new after it is dried, even cleaner than when it was new! Wow! Then the real challenge, the mattress. With experience from cleaning the pad, I decided to use the solution much more efficiently. Here is the improved process: 1) Spray a little solution on the stained area. Make sure the stained area is soaked, but not too deeply. 2) Cover the soaked area with a piece of paper towel. I found it absorbs the stain very well. 3) Spray a little more solution onto the paper towel. This is for keeping the stain moisturized. These enzymes do not work under dry environments. 4) Cover the stained area and the paper towel on it with a piece of plastic film, which is normally for preserving food. Again, I did this to keep the stained area wet. The second morning, I removed everything from the mattress, used more paper towels to absorb the mess. And then, I used a clean car washing towel and cold water to clean up the remaining mess. I washed the towel and cleaned up again. Repeated three to four times, the mattress became very clean! No blood stain remains! Never imagined it could remove 20-year-old bloodstains.” —nusaco888
Get it from Amazon for $10.99+ (available in three sizes).