If it's anything like my Vectra, there will be a filter between the bottle and pump somewhere.
I've recently had to clean mine 3 times. Not sure what's going on. The car is nearly 4 years old and I've not previously had to clean the filter or flush out the tank, and I've always used the same screen wash solution (carplan), but now all of a sudden the screen wash has started to go slimy and lumpy. Maybe it's a bad batch that I've bought?
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