Marine vessels and RV's trap some pretty noxious odors! DeOdorPRO 50g packets offer double the performance, double the value compared to any competing product! Shop and compare! DeOodorPRO offers the most effective, simple, safe, easy to use products with simple to use directions. We guarantee you will smell the difference! For heavy duty odors, we recommend using LiquaSan liquid deodorizer in tandem with the gas treatment for maximum results!