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For anyone curious, Technology Connections has a good video on how traditional automobile rain sensors work:

https://www.youtube.com/watch?v=TLm7Q92xMjQ

He mentioned that they aren't perfect.

I had a BMW which had an absolute perfect calibration of the sensor. It just WORKED.

Then I got a new windshield and all fell apart. As it was a BMW, I had to go to the dealer and have the rain-sensor re-calibrated.

And then it worked flawless again.

I had a similar experience with a BMW. The rain sensor in every car after that has been much worse.

Excellent watch, thanks.

I really enjoyed how he was struggling to balance the laser with a lightbulb. That seems like one of the worst household objects available for the task.

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