An automatic dispensing device for volatile fluid operable to apply one or more agent to a local environment for more than 14 days. Preferred devices dispense a first agent for air freshening, and may optionally dispense a second agent, such as a drain cleaner. A workable drain cleaner is structured to permit a slow release of drain cleaning agent. A dispensing device may nonexclusively operate by evaporation of volatile fluid from a carrier material that is infused with the volatile fluid； gravity-induced drip from a bulk supply of volatile fluid through a small orifice onto an emanator； osmotic transfer of volatile fluid from a bulk supply； gas-pump drive of volatile fluid at controlled pressure； or diffusion of volatile fluid through a wall of a container of bulk volatile fluid； and combinations thereof.
