The design consists of the features of shape, configuration, pattern and ornamentation of the portion of the WASHING MACHINE shown in solid lines in thedrawings. The portions shown stippled lines do not form part of the design.Drawings of the design are included, in which:Fig. 1 is a perspective view of a WASHING MACHINE of the present design;Fig. 2 is a front elevation view thereof;Fig. 3 is a rear elevation view thereof;Fig. 4 is a right side elevation view thereof;Fig. 5 is a left side elevation view thereof;Fig. 6 is a top plan view thereof; andFig. 7 is a bottom plan view thereof.