Abstract: A system for cleaning an interior of a holding tank particularly in recreational vehicles. The apparatus includes a holding tank for retaining fluids and a fluid distribution assembly which extends through the tank for dispensing pressurized fluid against an interior thereof. The fluid distribution assembly comprises a main fluid conduit which is connected to a plurality of lateral conduits by a series of vertical conduits and upper and lower T-connectors. The lateral conduits have openings positioned along the body of the conduits and at least one opening at each outer distal end of the conduits. The openings in the conduits allow a pressured spray of fluid like water to be released from the fluid distribution assembly and into the interior space of the holding tank.