I just make up a solution of water + screen wash at the appropriate concentration and store it in a container of known volume (I usually use a 2 litre juice bottle appropriately stored and labelled of course) then just fill the reservoir up. Once the bottle is empty just fill it up again - plus it's easy to dilute or make more concentrated depending on the season.
My dad always did this right back as long as I remember having a car.
My old time recipe for screen wash is a two litre bottle of water with a dash of methylated spirits and just two drops-no more-of washing up liquid. Cheap as, and works a treat.Cheers-John
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