The ornamental design for a scrubbing handle, as shown and described.
FIG. 1 is a left side view of a scrubbing handle in accordance with the present invention;
FIG. 2 is a front view of the scrubbing handle;
FIG. 3 is a top down view of the scrubbing handle;
FIG. 4 is a bottom up view of the scrubbing handle; and,
FIG. 5 is a front isometric view of the scrubbing handle.
The broken lines are included for the purpose of illustrating portions of the scrubbing handle that form no part of the claimed design. The broken lines that depict lettering and line designs within the bounds of the continuous scrubbing handle are for illustrative purposes only. None of the broken lines form a part of the claimed design.