A cleaning device (I) for suctioning a volumetric flow of particle-laden suction-air from an environment, includes: an air-receiving opening (2) having a first line cross section (21) for suctioning the volumetric flow of particle-laden suction-air from the environment in an active operating state; a liquid-receiving unit (4) having an immersion tube (3) for receiving a liquid, wherein the immersion tube (3) is connected at a first end (7) to the air-receiving opening (2) for conducting suction air and is designed such that at a second end (8) it is immersed into the receivable liquid such that, in an active operating state, the volumetric flow of particle-laden suction-air flows through the receivable liquid to trap the particles; and a vacuum generator (6) for generating the volumetric flow of suction-air in the active operating state.