The ornamental design for a cleaningbrush, as shown and described.
FIG. 1 is a front, left and bottom perspective view of the cleaning brush showing the new design;
FIG. 2 is a front elevation view thereof, the rear elevation view being a mirrored image thereof;
FIG. 3 is a left side elevation view thereof, the right side elevation view being a mirrored image thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a cross-sectional view taken along the line indicated in FIG. 4.
The broken line showing of the cleaning brush is for the purpose of illustrating portions of the cleaning brush and forms no part of the claimed design.