Use membrane technology, no leak. Good for car, home, and etc. Membrane Dishwasher aroma air freshener Membrane Dishwasher aroma air freshener:Use membrane and bubble technology with plastic or paper structured assemblyGive you luxurious feel and smell from large numbers of flavor and fragrance collectionsBoth Mounting & Hanging types can be used in Car, Truck, Boat, RV, Closet, Dish ...