The ornamental design for a portablewindshieldwashingcontainer, as shown and described.
FIG. 1 is a first top isometric view of the portable windshield washing container of the present invention, shown with the lid in an open position;
FIG. 2 is a second top isometric view thereof;
FIG. 3 is front, bottom isometric view thereof;
FIG. 4 is a top, front isometric view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a left-side view thereof;
FIG. 8 is a top view thereof; and,
FIG. 9 is a bottom view thereof.
The broken lines shown on the portable windshield washing container is included for the purpose of illustrating portions of the container that forms no part of the claimed design.