The 4 oz. size is perfect for your boat’s head, bilge, hanging and storage lockers, and galley cupboards. It will also take care of nasty odors in your car, your gym locker, and laundry room. Contains 100% Natural Australian Tea Tree Oil. For Boat, Car, RV, and Basements – Non-Toxic, Biodegradable. Airborne Disinfectant That Attacks Bacteria, Mildew and Odors.