I'm a drummer, I hit things!
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To go back to the original question, if your screenwasher level is low, because of the positioning of the pump in the washerbottle, which higher than the screenwasher pump, it will only pick up air, which might exlain no headlamp wash. It's probably to preserve some screenwash function over headlamp cleaning if the level is low.
Currently in bigiainw's garage:
2016 Skoda Octavia Scout 2.0 CR 150 in Cappuccino Beige/ 2006 Renault Clio III 1.2 16v 3dr Extreme in Post Box Red/ 2013 Renault Trafic LL29 2.0 dCi (euro 5) Sport Passenger in Luxurious Gun Metal Grey with Cruise control, now with parking sensors!!!