The ornamental design for a handwashingdevice, as shown and described.
FIG. 1 is a perspective view of a hand washing device showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is another perspective view showing the hand washing device in a position of use.
The broken lines in the drawings depict portions of the hand washing device in which the design is embodied that form no part of the claimed design. The broken lines at the bottom of the article in FIG. 8 depict environmental subject matter that forms no part of the claimed design.