An ornamentaldesign for a hand washing station, as shown and described.
FIG. 1 shows a perspective view of a hand washing station;
FIG. 2 shows a right view of the hand washing station of FIG. 1;
FIG. 3 shows a left view of the hand washing station of FIG. 1;
FIG. 4 shows a back view of the hand washing station of FIG. 1;
FIG. 5 shows a front view of the hand washing station of FIG. 1;
FIG. 6 shows a top view of the hand washing station of FIG. 1; and,
FIG. 7 shows a bottom view of the hand washing station of FIG. 1.
The broken lines showing portions of the hand washing station are included for the purpose of illustrating the environmental structure and form no part of the claimed design.