Abstract: An improved scraping tool is provided for removing barnacles from the propeller shafts of boats with inboard marine engines while the boat is in the water. The scraper is comprised of a curved metal blade with cutting edges on each end which engage substantially one-half of the periphery of the workpiece to remove the debris when moving the tool longitudinally in both directions to effect the desired scraping action. A handle is fastened longitudinally on the axis of the blade and centered on the body of the tool, to easily grasp and position the tool positively on the workpiece from a perpendicular position, and yet provide the leverage necessary to forcefully attack the barnacles.