We had some blood spilled on the carpet.
We tried a spot remove spray but it didn`t remove the stain.
We then had Stanley Steemer come in and it looked great,
until it dried...then the stains reappeared.
We then used OxiClean to scrub the stains.
Worked great - too great.
It removed the stains but lightened the carpet (to its original color - we could tell because it was the same as some areas that had furntiture over them).
I then mixed OxiClean and water according to the directions on the container and poured it into the Bissell water tank,
put the machine on water only and went over the carpet.
Cleaned the carpet up to its original color and we can`t tell where the blood was.