Quote:
Originally Posted by Tatsfield
It also matters which screen wash additive you use. Cheap additives containing detergents can allow bacterial breeding which creates gloop. Alcohol rich additives like Volvo's own will kill bacteria in the wash fluid and improve flow. They do make it smell like you have been holding a vodka tasting in the car when you use the washers but they do keep the up flow rate.
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Yes, quality matters, but the concentration does too. Some people put far too much screen wash in the reservoir. More isn't better, it actually does more harm than good!