I also tried Red Vanish from Vacaway for the first time. Someone had spilt a red pop drink on the 3rd floor then hired a "professional" carpet cleaner who smeared it all around. Sprayed it then went about cleaning the hallways. 3 hours later, it had turned from red to light brown. Cleaned over it then sprayed it again and left. Next day got an email from the concierge saying the stain is completely gone. Products like oxidizers and reducers often need time to work. Just because you don't see a change immediately, doesn't mean the product isn't working. I think that's a good product to have in the truck.