Abstract: A device for spraying an inner surface of an enclosure with a cleaning and/or deodorizing chemical is disclosed. The device can include a container for the chemical, a container holder, a sprayer through which the chemical can be sprayed laterally at least halfway around a perimeter of the sprayer, a clip attaching the sprayer near a rim of the toilet bowl, a fluid conduit in fluid communication with the container and the sprayer, and a retention mechanism retaining the container in the container holder. One form of the retention mechanism includes a retainer having a plurality of flexing tabs that engage a flange on the holder. In another form, the retention mechanism can include inwardly directed flanges on an inner wall of the holder, a projection spaced apart from each flange, and a retainer with a plurality of fins. A refill for a dispensing system is also disclosed.