The ornamental design for the drain grease container, as shown and described.
FIG. 1 is a perspective view of my new design for a drain grease container;
FIG. 2 is a quarter-rotated side view of the drain grease container, the three-quarter-rotated side view is a mirror image thereof;
FIG. 3 is a front view thereof, the half-rotated side view is a mirror imager thereof;
FIG. 4 is a top plan view of the drain grease container;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a front perspective view of the drain grease container in an intended environment of use with absorbent material (shown in broken lines) positioned in the drain grease container.
The broken lines depict portions of the drain grease container and form no part of the claimed design.