We accepted an assignment to cure a long standing problem of moisture, mold, fungus and animal urine. After much cleaning and scrubbing with bleach and other products, the surfaced passed the sanitation test, but there was always a nagging urine smell on damp days. After finding out about ClenAir Odor Neutralizer, I put one tub in the return air duct-work and …Walla//KaZam!!! When the staff came in the next day…NO MORE DOGGY ODOR!!!