I use screen washer bottle additives all the time to help clean the windscreen. My main additive is from ASDA that I believe is a Carplan product (blue in colour). It is the type that you dilute to suit weather temperatures and has been very good over the years. I have this last year, bought a Summer Prestone product that helps clear bugs etc. This product made my blades squeak badly and it took time for it to clear from the bottle. I changed the blades (£22 a set) as I did not know it was the fluid that was the culprit. The remainder of the bottle has been diluted and used to soften and remove bugs from the bodywork. It also works very well to get rid of bird droppings. I have also tried VW's own product that is excellent and valuewise is quite reasonable, compared to the ASDA product. This has capabilities of going to -40C if required. What do you other people use?
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