An washing machine for washing trays. The machine includes a housing, a frame, a water system, and an air system. The frame is rigidly mounted in the housing and holds the trays to be washed at a tilted angle so that fluids completely drain there from and accordingly facilitate the washing and drying processes. The water system is contained in the housing and supplies water to wash the trays. The air system is contained in the housing and supplies air to dry the trays.