A tool for washing out drill cuttings accumulations in blowout preventer stacks connected to oil and gas well prior to testing the blowout preventers. The tool utilizes a finned tubular member and a brush to break away and fluidicly scour drill cuttings and the like from the well head casing connection and the blowout preventers and riser casing connected thereto with high pressure fluids emitted from the tool being directed into the crevices of the preventers, thereby flushing cuttings accumulations upwardly, through the riser casing to the surface for removal, prior to pressurizing the well head and testing of the system by actuating the ram type blowout preventers.