The ornamental design for a grillbrush, as shown and described.
FIG. 1 is a right side elevational view of a grill brush showing our new design, the left side being a mirror image;
FIG. 2 is a front elevational view thereof, the rear end being a mirror image;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a top plan view thereof.
The broken lines shown in FIGS. 1 and 2 represent a handle portion of the grill brush that forms no part of the claimed design. The broken lines in FIG. 4 represent the boundary of the design and form no part of the claimed design. The bristles are partially shown for ease of illustration in FIGS. 2-4, it being understood that each set of bristle groups extends radially from the twisted support as shown by the bristle groups in FIG. 1.