The utility model relates to a water tank device that is applied to clean the cooling system of the motor, in particular to a water tank cleaner that is applied to clean the water tank of the cooling system of the motor by chemical extrinsic cycle. The utility model comprises a movable bracket whose middle part is provided with an alkalescence heating pot whose one side is provided with a high pressure steam storage tank and an acid liquor storage tank and whose lower part is provided with a recycle pump. The above parts and recycle pump are connected by pipes and valves.

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