A cleaning tool includes a cord-like structure formed from yarn, that includes at least in part thereof fine fibers of which the fineness of a single fiber is 1. Preferably, the fluid grid system is designed such that components thereof may be readily connected to each other without the use of clips or other fasteners. At the inside of the door further key operable lock means are provided solely to operate and, if required, to de-actuate, the blocking means. A curved part is formed between the outer wall surface and back face, and has a radius of curvature R in a range of 4 mm to 25 mm in the longitudinal direction of the ceramic supporting member. Rather than making a green read while being positioned behind the ball with respect to the cup as in conventional green reading techniques, in the disclosed expert green reading techniques a golfer takes a specific, precise, and consistent stance on or adjacent to a path between the ball and the cup.