FIG. 1 is a top, front perspective view of a detergent pouch embodying the new design; FIG. 2 is a top plan view thereof; FIG. 3 is a bottom plan view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a back side view thereof; FIG. 6 is a left side view thereof; and, FIG. 7 is a front side view thereof.