FIG. 1 is a top perspective view of a wire brush showing my new design. FIG. 2 is a rear perspective view thereof. FIG. 3 is a left elevational side view thereof. FIG. 4 is a right elevational side view thereof. FIG. 5 is a top plan view thereof. FIG. 6 is a bottom plan view thereof. FIG. 7 is a front elevational view thereof; and, FIG. 8 is a rear elevational view thereof.