A system for selectively spraying a treating material such as an insecticide and/or odor suppressor into the interior of a commercial garbage or trash container. The system includes a suitable spray nozzle assembly carried on the cross bar of the lifting frame of a conventional front loading sanitation truck and a biased access door in the trash container or bin through which a spray nozzle may be inserted into the interior of the container. A container of the insecticide and/or odor suppressor is carried on the truck together with controls placed in the vehicle's cab and controlled by the operator to insert the spray nozzle into the container, spray the container's interior, and retract the spray nozzle.