Frigi-Clean will remove bacteria, mold, spore, road grime, nicotine build-up, and debris restoring heating/cooling efficiency. Debris and fallout can collect in the ventilation system and collect moisture, allowing bacteria, mold, and fungi to grow. As a result, your vents will push those spores and bacteria out every time you turn on your AC or Heater. Mold, Spores, Fungi, and Bacteria can all cause respiratory problems such as asthma, infections, and illness. Using Frigi-Clean eliminates the debris and fallout collecting in your evaporator, leaving behind a clean, fresh, and efficient ventilation system.