To do Hanging Windshield Wipers, you need a Pull-Up Bar.
1-Grasp the inner handles, as if doing a chin-up and engage your abs so that you are able to bring your toes up to the bar, your upper back as parallel to the floor as possible. This is the center position (Position A in the picture above).
2-Keeping your core as stable as possible and your upper back parallel to the floor, begin to tilt your legs at a 45 degree angle to your right. Pause for one count (Position B in the picture above).
3-Bring your legs back to center, your toes going straight up towards the bar (Position A).
4-Begin to tilt your legs at a 45 degree angle to your right. Pause for one count (Position C). Bring your legs back to center. This is one repetition.
Do as many repetitions as you can.
I added this video from YouTube to demonstrate the exercise. Much better to watch this exercise than to simply look at pictures.