Cleaner in a kind of expanding hole, it includes that sleeve, one stretch through the operation rod piece of the what casing in the form of slidably, and one connection setting the what casing and the operation rod piece between flexible body, the pliability body is flexible knitted body and can pass through the control of the operation rod piece and collect or expand, user can allow cleaner to protrude into duct Hou to collect state, the pliability body is expanded against into what duct inner wall, the dirt for accumulating what duct inner wall can be struck off cleaning, effectively achieve the effect of cleaning duct inner wall.一種擴張式孔內清潔器，其包括一套管、一以可滑動形態穿伸於該套管的操作桿件，以及一連結設置於該套管與該操作桿件之間的可撓性體，該可撓性體為可撓性編織體且可透過該操作桿件的控制而收束或擴張，使用者能夠讓清潔器以收束狀態伸入孔道後，將該可撓性體擴張抵靠於孔道內壁，能夠將積留於孔道內壁的污垢予以刮除清理，有效地達到清潔孔道內壁的效果。
