NosGuard SG Mold/Mildew Odor Control Boat Bomb Removes and prevents mold/mildew odors within 6 hours. Also removes and prevents any other foul, unpleasant odors. Uses patented system to generate a deep-penetrating chlorine dioxide vapor that thoroughly permeates 100% of treated area. Not to be used while people or pets are present, but treated area is safe for use after being aired out.