Our dog had been urinating on a rug we have under our dining room table and we didn’t realize he had been doing it. When we went to move the rug yesterday to clean it, the urine had soaked through onto the hard wood floor. There is a decent size area on the floor that is brownish black in color. Does anyone know what we could use to remove the stain on the floor? We tried household cleaners and a steam cleaner with no luck. Any ideas are appreciated.