Does anyone know, how much screenwash should I expect to lose through evaporation? On my newish 208 I filled it into the neck but leaving about an inch of room at the top. After seven days the level had gone down two inches, without me using the screenwashers at all. It then continues down at about the same rate - i.e. it doesn't seem to settle at any level. The dealer says there are no leaks and it must be evaporation as "unfortunately it's not a sealed system". I've never noticed losing so much on previous cars. The top image below is 4 October as topped up at its one year service, the bottom is 6 October, screen washers not used in between.