will provide oscillating action or other devices known to mechanical engineers skilled in the art the oscillation action is preferred by some boat owners because residual cleaning streaks are all oriented in the direction of motion of the boat and thus offer a slightly reduced drag over the surface 5 lateral motion of the entire apparatus while cleaning a surface can be accomplished by the operator tilting the bell away from the desired direction of lateral motion the tilt of the bell will cause the edge of the bell facing in the desired direction to lift and there is then greater input flow from the lifted side than the low other side and there will consequently be greater pull in the direction which has been lifted alternatively lateral or sideways motion is accomplished by selectively opening valves in the sides of the bell opening a valve in the side towards which motion is desired the sideways suction aids sideways motion 6 to adapt to curved boat hulls the bell may be made into more than one solid piece there will be multiple flaps on the side of the bell which can pull back from projection or curves and return to normal when the underwater surface.