FIG. 1 is a perspective view of a washboard for washing machine, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is another side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a bottom perspective view thereof;
FIG. 9 is a perspective view of the washboard for washing machine in an alternate configuration;
FIG. 10 is a front view thereof;
FIG. 11 is a rear view thereof;
FIG. 12 is a side view thereof;
FIG. 13 is another side view thereof;
FIG. 14 is a top view thereof;
FIG. 15 is a bottom view thereof; and,
FIG. 16 is a bottom perspective view thereof.
The broken lines in the figures illustrating portions of the washboard form no part of the claimed design.