are you using it when you come across urine spotted homes. For example a home with pee spots through out. How does it work? How are you mixing it? Hf or Pump up. Is it effective and is it the same as smoke outs Urine stain removal. Can you use USR RTU and add it to a pre spray to help remove the spots. Or is the 40 vol a board myth? Any suggestion for this type of issue.