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I guess they prob work every so many cycles, i.e. no point in thetm spraying headlights everytime you do the windscreen. thats how my bmw works - not sure with my clio though lol
Think it's one in every 3 washes. But I can't be bothered to go out and look because it's been snowing, and it'd just be to depressing to go and see how mucky my car is...