Marine Shocker ClO2 Boat Odor Eliminator Eliminate Any and All Sever Boat Odors. Guaranteed or Your Money Back! Not a masking agent. Will remove odors permanently! Revolutionary new technology facilitates the use of Chlorine Dioxide for Boat interiors. Removes odors caused by mold, mildew , fish , fuel odor, cigarette , cigar , pet urine , vomit , gas , chemical, soured milk , and any other bad smells. Drastically improves interior air quality Easy to use and will also clean out air ventilating system and filters. Just ad water and let set for minimum of 2 hours to a maximum of 24 hours depending on severity of problem