My dog got sick one night...and threw up multiple times...in multiple places on my new rug. Thought I got all it out of my rug, but weeks later, all the spot areas that I had cleaned started turning dark. YUCK...something growing/molding in there. TRIED EVERYTHING! And most didn't work at all, others worked after tons of scrubbing only to have it come back a week or so later. Then a cousin told me to get "Unbelievable". SO GLAD I DID! This stuff worked fast! I had to repeat treatment a few times, using white towels on top and underneath. But after a couple of times....the stains stopped coming back....and my large area rug looks great again! It's named well! I scrubbed less...and got better and faster results. Actually...nothing else I used worked...this did! So thankful that I have a cousin that knows a thing or two about getting carpet stains out! UNBELIEVABLE - works!