AirSept’s AC Odor Shield stops air conditioning odor for up to one year. This formula combines a powerful anti-microbial with a unique moisture-shedding coating. The hydroscopic coating forces moisture to bead and roll off rather than stick to A/C system surfaces. The anti-microbial is embedded in the coating, and kills odor-causing micro-organisms on coated surfaces. Any technician that can replace a Cabin Air Filter (CAF) can apply AC Odor Shield. Simply spray in through the opening while the CAF is out. Dry in ten minutes using the vehicle heating system.