The ornamental design for a grillbrush, as shown and described.
FIG. 1 is a perspective view of a grill brush.
FIG. 2 is a right side view of the grill brush of FIG. 1.
FIG. 3 is a left side view of the grill brush of FIG. 1.
FIG. 4 is a front view of the grill brush of FIG. 1.
FIG. 5 is a rear view of the grill brush of FIG. 1.
FIG. 6 is a top view of the grill brush of FIG. 1; and,
FIG. 7 is a bottom view of the grill brush of FIG. 1.
The broken lines in the drawings depict portions of the grill brush that form no part of the claimed design.
The lighter solid lines denote surfaces and contours. Line shading is not surface ornamentation.
The handle shown in the drawings is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.