i have tried EVERYTHING on the market for pet stain removing and i will not have to buy anything else but WOOLITE POWERSHOT. this stuff is amazing. i spray the stain and by the time i turn around to dry the carpet, it's gone! thought it was one of those 'claim to remove the stains, old and new' but i thought i'd try it. so glad i did. I have been telling all my friends with pets. thanks for coming up with such a great product that actually does a fantastic job.