There is certainly a place where it is hard to fall unless it is in this shape. The place where the toothbrush does not enter is used separately for this and the cylindrical brush (large and small) obtained here, but this is more powerful. However, due to the bending of the arm which is the reason why power can easily enter, it does not enter a narrow place such as the back of the gap of the air-cooled fin. Can not you call Nuki Kitchi reaching all the way? Then there is nothing for replacing the polished part?