Moved into a new place. For two years, my dog decided to make a bedroom her place to do all her business. The light carpet had actually become a dark brown and rust color throughout. My other dog would go into the room, smell the carpet, and leave! He couldn't even take it! Try as I might, nothing got the stain out. I thought I'd have to replace the carpet. With just one application of Bissell's 2X Odor & Pet formula, in my Bissell Pro Heat Pet shampooer, the stains and odor came out! It left a fresh scent, too. The carpet looks brand new. I also suffer from allergies and respiratory illnesses. I cannot use many products because they are way too strong, and will trigger attacks. This product didn't both me at all. That night, I finally used the room. My dogs came into the room, sniffed it all over, then stretched out on the carpet. They never, ever did that before! I would definitely recommend this product. I also gave some to my nephew, who has a puppy-in-training. He has become obsessed with carpet cleaning now, because the product works so well.