A cleaner structure includes a main body, a forced element and an elastic element. The main body includes a first casing, a floating element, a second casing, first perforations and second perforations. The floating element is disposed within the first casing. The second casing is connected with the first casing for storing a cleaning agent. The elastic element is connected with the first casing and the forced element. During the water level of the liquid inside the toilet tank is changed from a low level to a high level, the second casing is at least partially immersed in the liquid, so that the cleaning agent is released to the liquid.