To provide a small hole in a suction part in which a rod of a smaller diameter than that is retractably inserted for easily taking choking pebbles caught between the inner side of the small hole and the outer side of the rod, if any.

Retractable insertion rods 1 of a smaller diameter than small holes 19 in a suction part are collected to be one arm 16 to be inserted into a hole in a wall above the suction part to penetrate a support hole provided in a grip part of a cleaning device, it is set long the grip part, a coil spring 11 is provided on an outer circumference of the grip part, a lower part of the coil spring 11 is fixed to a fixing plate 15 integrated with the grip part, with an upper part of the coil spring fixed to a grip operation part 13, in the condition where the coil spring 11 is not elongated or contracted, the arm 16 set along the grip part is further inserted into a hole in the fixing plate 15, and the outer side of the coil spring 11 is set to it to be fixed to the grip operation part 13. At this time, the retractable insertion rods 1 are inserted to the small hole in the suction part.