Forespar's Tea Tree Power™ mold, mildew and odor eliminator is a non-toxic and bio-degradable air cleaner formulated with the highest concentration of 100% Australian Tea Tree Oil available to attack and degrade airborne spores while penetrating porous boat surfaces to eliminate the odor source. It maintains a healthy air quality and leaves a subtle, naturally clean scent throughout the boat. Not just a cover-up fragrance. Tea Tree Power™ Gel is long lasting and provides continuous odor control, plus mold & mildew prevention for up to 3-months by simply opening and placing where needed.