They work on every third pull of the washer stalk but the lights need to be on. I had to ask this question a while back as I didn't think mine were working.
as simon said every third wash of the windscreen. I leave my lights on nearly all the time, everytime you turn off the car it will reset so if you leave the lights on when you go back to the car if you wash the windscreen it will always wash the lights too first time.
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