A method for operating a WC basket, wherein the WC basket comprises, ▪ a sensor unit, ▪ a control unit, ▪ a release element, ▪ at least one container for storing at least one preparation, wherein the release element and the container are interconnected in a communicating manner, and the preparation comprises at least one fragrance, preferably perfume oil, at least one surfactant or an emulsifier and water and has a viscocity of less than 2000 mPas, in particular less than 1000 mPas, measured using RotoVisko LVTV II, spindle 31.5 rpm, 20°C, wherein the flushing water flows through the toilet bowl within a flushing-water period [t 1 -t 2], in which t 1 represents the start of the flushing-water flow and t 2 represents the end of the flushing-water flow, and a) the sensor unit detects triggering of a flushing-water flow guided through the toilet bowl within the flushing-water period [t 1 -t 2] at a time t s, b) the sensor signal, which represents triggering of the flushing-water flow, is sent to the control unit, c) the control unit converts the sensor signal into a control signal for the release element, such that the preparation is released from the container by the release element into the interior of the toilet bowl, d) wherein the preparation is released from the container by the release element with a time delay Δt after detection of the flush flow by the sensor unit at the time t s, wherein the time delay Δt is between 1-10 seconds, preferably between 1-5 seconds, particularly preferably between 1-3 seconds, and the release period Δt I is between 0.25-2 seconds, preferably between 0.5-1.5 seconds, particularly preferably between 0.75-1.25 seconds, and the amount of preparation released within the release period Δt I is between 0.05-0.5 ml, preferably 0.075-0.3 ml, particularly preferably 0.1-0.2 ml, and no preparation is released if the sensor unit has detected the end of the flushing-water flow t 2. ▪ a sensor unit, ▪ a control unit, ▪ a release element, ▪ at least one container for storing at least one preparation, wherein the release element and the container are interconnected in a communicating manner, and the preparation comprises at least one fragrance, preferably perfume oil, at least one surfactant or an emulsifier and water and has a viscocity of less than 2000 mPas, in particular less than 1000 mPas, measured using RotoVisko LVTV II, spindle 31.5 rpm, 20°C, a) the sensor unit detects triggering of a flushing-water flow guided through the toilet bowl within the flushing-water period [t 1 -t 2] at a time t s, b) the sensor signal, which represents triggering of the flushing-water flow, is sent to the control unit, c) the control unit converts the sensor signal into a control signal for the release element, such that the preparation is released from the container by the release element into the interior of the toilet bowl, d) wherein the preparation is released from the container by the release element with a time delay Δt after detection of the flush flow by the sensor unit at the time t s, wherein the time delay Δt is between 1-10 seconds, preferably between 1-5 seconds, particularly preferably between 1-3 seconds, and the release period Δt I is between 0.25-2 seconds, preferably between 0.5-1.5 seconds, particularly preferably between 0.75-1.25 seconds, and the amount of preparation released within the release period Δt I is between 0.05-0.5 ml, preferably 0.075-0.3 ml, particularly preferably 0.1-0.2 ml, and no preparation is released if the sensor unit has detected the end of the flushing-water flow t 2.