A movable rack assembly for a washer, comprised of: a rectangular frame comprised of: a central hub connectable to a fluid source; a plurality of elongated tubular base members extending from said central hub, said tubular base members defining a bottom portion of said rectangular frame, each of said tubular base members having an internal cavity that is fluidly communicable with the central hub; a pair of spaced-apart elongated, tubular side members (132A, 132B) defining side portions of said rectangular frame, said tubular side members (132A, 132B) lying in planes that are parallel to each other, said tubular side members (132A, 132B) defining a space therebetween, said tubular side members (132A, 132B) having distal ends, each of said distal ends being connected to an end of one of said tubular base members; a plurality of spaced-apart transverse members, each of said transverse members having an end (142a, 142b) connected to a respective one of said tubular side members (132A, 132B), said transverse members traversing the space defined between said tubular side members (132A, 132B), each transverse member having an internal cavity that is fluidly communicable with internal cavities of the respective one of the side members (132A, 132B) connected thereto; a plurality of rotary spray arms, said rotary spray arms being attached to a respective one of said transverse members; a plurality of bosses, one disposed near each first end and second end of each of the transverse members, each boss being a tubular element having a cavity extending therethrough, the bosses being respectively attached to the transverse members, each of the cavities of the bosses being configured to fluidly communicate with the internal cavity of the transverse member to which the boss is attached; and a plurality of corner spray nozzles, one disposed in each boss, each of said corner spray nozzles being configured to direct fluid toward corners of said rectangular frame, wherein, respectively, said internal cavities of said tubular base members, said internal cavities of said tubular side members (132A, 132B), said internal cavities of said transverse members, said cavities of said boss members are fluidly connected with each other and fluidly connect said rotary spray arms and said corner spray nozzles with said central hub, and wherein fluid is respectively conveyable from said internal cavities of said transverse members to said corner spray nozzles through said bosses. a central hub connectable to a fluid source; a plurality of elongated tubular base members extending from said central hub, said tubular base members defining a bottom portion of said rectangular frame, each of said tubular base members having an internal cavity that is fluidly communicable with the central hub; a pair of spaced-apart elongated, tubular side members (132A, 132B) defining side portions of said rectangular frame, said tubular side members (132A, 132B) lying in planes that are parallel to each other, said tubular side members (132A, 132B) defining a space therebetween, said tubular side members (132A, 132B) having distal ends, each of said distal ends being connected to an end of one of said tubular base members; a plurality of spaced-apart transverse members, each of said transverse members having an end (142a, 142b) connected to a respective one of said tubular side members (132A, 132B), said transverse members traversing the space defined between said tubular side members (132A, 132B), each transverse member having an internal cavity that is fluidly communicable with internal cavities of the respective one of the side members (132A, 132B) connected thereto; a plurality of rotary spray arms, said rotary spray arms being attached to a respective one of said transverse members; a plurality of bosses, one disposed near each first end and second end of each of the transverse members, each boss being a tubular element having a cavity extending therethrough, the bosses being respectively attached to the transverse members, each of the cavities of the bosses being configured to fluidly communicate with the internal cavity of the transverse member to which the boss is attached; and a plurality of corner spray nozzles, one disposed in each boss, each of said corner spray nozzles being configured to direct fluid toward corners of said rectangular frame, wherein, respectively, said internal cavities of said tubular base members, said internal cavities of said tubular side members (132A, 132B), said internal cavities of said transverse members, said cavities of said boss members are fluidly connected with each other and fluidly connect said rotary spray arms and said corner spray nozzles with said central hub, and wherein fluid is respectively conveyable from said internal cavities of said transverse members to said corner spray nozzles through said bosses.