The ornamental design for a cleaningsponge, as shown and described.
FIG. 1 is a perspective view of a first embodiment showing the new design for a cleaning sponge;
FIG. 2 is a top view thereof;
FIG. 3 is a right side view thereof, the left side view being a mirror image thereof;
FIG. 4 is a front view thereof, the rear view being a mirror image thereof;
FIG. 5 is a perspective view of a second embodiment showing the new design for a cleaning sponge;
FIG. 6 is a top view thereof;
FIG. 7 is a right side view thereof, the left side view being a mirror image thereof; and,
FIG. 8 is a front view thereof, the rear view being a mirror image thereof.
The figures depict a two layer structure. Also, it is understood that the surface shading is not intended to be indicative of gloss or texture and forms no part of the claimed design.