drawing in its closing position in which it is pressed by pre stressing of resilient yoke 33 against the liquid outlet opening 24 and closes this opening if the cleaning liquid should flow from the storage space 18 into the through passage 28 of the brush body the slide 16 is pulled with the thumb in the upward direction of handle 11 whereby spring yoke 33 with the valve member 32 will be lifted from the liquid discharge opening 24 as soon as slide 16 is released from the thumb it will be moved back by the force of yoke 33 to its initial position shown in fig2 and the valve member 32 will again close the discharge opening 24 fig5 shows the plan view of the external side of a supporting plate 37 which is inserted in a threaded ring 38 as shown in fig6 ring 38 has an internal thread 27 for securing to the external thread 25 of the bottom wall of the brush body 10 at the external side of supporting plate 37 which is provided with a central through opening 36 are arranged a plurality of acute hooks 35 bent to the surface of the supporting plate 37 at different angles these hooks can be made of one piece with the supporting plate of synthetic plastic material a brush body for example of foam as shown in fig4 b can be.