I'm "guessing" that for a very brief moment your wiper blade is mimicking the effect of a focal plane shutter at it passes over the brightly illuminated sign on the building as well as the reflection in the road. It's as if the camera is shooting at a faster shutter speed for that one moment and only in those isolated spots. The image is also briefly darker at those locations. The phenomenon would be a combined effect of the camera's electronic rolling shutter and the wiper blade "shutter". I'm not 100% certain that this is the explanation but this is my theory at this point.
The wiper blade also seems to be pushing water across the glass which is refracting the light but that seems to be a separate phenomenon.
A focal plane shutter is a mechanical set of "curtains" that very quickly shoots across the film plane in a camera.
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Dotted line is the sensor. Colored rectangles are the shutter blades.
Notice that the road surface also appears sharper right at the point where the wiper blade "shutter" is passing.
Compare it to the first screen shot above where the wiper blade is in a different location and the road in the same spot is not as detailed and is blurred.
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