Abstract: A boat cleaning apparatus comprising framework for suspending a boat in the air, a frame having rotatable brushes positioned to clean a portion of the length of the sides and bottom of the boat, spray nozzles attached to the frame for directing an aqueous acid solution or steam against the boat, and wheels supporting the frame and enabling the frame to be moved along the length of the boat. The brushes rotate as the frame is moved along the length of the boat and thereby clean the full length of the sides and bottom of the boat.