In order to provide a surface treatment device for treating a surface of a workpiece that can be operated easily and reliably, it is proposed that the surface treatment device comprises the following: a working area, in which the surface of the workpiece can be treated; a flow-conducting device, by means of which a stream of gas can be made to pass through the working area; and a solvent depositing device, for depositing solvent from the stream of gas that is made to pass through the working area, wherein the solvent depositing device can, according to choice, be set to a depositing state or to an inoperative state, the solvent depositing device in the depositing state depositing solvent from the stream of gas.