The ornamental design for a bathingsponge, as shown and described.
FIG. 1 is a top front perspective view of a bathing sponge, shown in use;
FIG. 2 is a top front perspective view of a bathing sponge;
FIG. 3 is a front elevation view of a bathing sponge;
FIG. 4 is a rear elevation view of a bathing sponge;
FIG. 5 is a right side elevation view of a bathing sponge;
FIG. 6 is a left side elevation view of a bathing sponge;
FIG. 7 is a top elevation view of a bathing sponge; and,
FIG. 8 is a bottom elevation view of a bathing sponge.
The broken lines used in the drawings to illustrate a child bathing, as well as the “laces” of the bathing sponge represent environmental subject matter that forms no part of the claimed design.