We have a history of allergies in our family and our daughter has it the worst. When she came home from Stanford over winter break, she could barely sit down in our living room, apparently because of one of our dogs. The URFresh guys explained that various things are hidden below the surface and last long after the dog's contact. They explained their process to my daughter and she understood the chemistry involved. I was skeptical, but am now among the converted. After treatment, the problem was solved for our daughter, so we plan to have the UR Fresh treatment done twice/year. The guys were professional, came when they said they would and when it was convenient for us, and left our home as they found it.