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My suspicion is this:
The "auto" position is the intermittent position. Yes, you get one swipe when you turn it to intermittent if it isn't raining, or if you always leave it in intermittent you will get one swipe when starting the car/turning on the ignition.
For the sensor to work, the switch has to be in intermittent, so when you are pouring water over the sensor, is the switch in the intermittent position???
Gilly
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