Biokleen Bac-Out Carpet & Fabric Stain and Odor Remover with Enzymes - 2 Pack, 32 oz (64 oz)

Used correctly, Biokleen is amazing! I had an old urine stain on beige colored carpet that had dried. I sprayed it with name brand steam cleaner pre-treat, scrubbed it in with a brush, steam cleaned and most of the stain was still there. A couple days later I put some Biokleen in a spray bottle. Don't use it from the squirt bottle it comes in. You'll just waste it. I sprayed the stained area, scrubbed it with a brush, sprayed again and let it work for 15 minutes. This is an important step for enzyme cleaners. Then I steam cleaned. The stain is gone! Highly recommended!