A washing system for washing equipment in a milking plant includes a closed flow circuit, a washing liquid source (14), a feeding part (7, 16) adapted to supply washing liquid from the washing liquid source (14) to a first portion (15) of the closed flow circuit and circulating part (10) adapted to circulate the washing liquid in the closed flow circuit during a washing process of the equipment (1, 2, 3, 8). The washing system further includes a heating part (7, 23-28) adapted to supply steam to at least a second vertical portion (19a) of the closed flow circuit during at least a part of the washing process for supplying heat energy to the circulating washing liquid. The second portion (19a) of the closed flow circuit is located at a distance from the first portion (15) of the closed flow circuit.
