Fellows.. the same problem reoccurred . I am not sure why this is happening. Before cleaning I would like to find out why this is happening. I am also attaching the snaps and I had given yellow dotted line around the place - how it would look like when there is light from the front. The whole windshield would look somewhat similar. But after 2-3 secs it disappears.If the wiper speed is minimum, it disappears before the next wipe. But if the speed is 2 or 3, then it stays.