If the wipers smear, wiping them down with a clean cloth and water can help from time to time. To ensure a clear view of what lies ahead, windshield wipers that work well are indispensable. “Unsuitable cleaning or washing fluids can cause paints or plastics to blister, dissolve material, and cause stress cracks in headlamps that are made of polycarbonates.” The DEKRA expert advises people to stay away from putting dish soap and other household cleaners in their washing fluid reservoirs. These will clean well in the summer while also providing protection against frost. Anyone who wants to be absolutely sure can rely on all-weather products with less antifreeze during the transition from cold to warm weather. Under some circumstances, however, flocculation may occur – for example, if a finished mixture that is not stable in hard water is put into a reservoir that contains a larger quantity of concentrate diluted with hard tap water. Generally, it is possible to mix summer and winter mixtures with one another. “Especially in the dark or when the sun is going down, light coming from up ahead and passing through a dirty windshield can cause glare, which impairs the driver’s vision, increasing the risk of accidents.” The DEKRA expert recommends using up all the winter windshield washer fluid in the reservoir before changing to the summer mixture. “An unsuitable windshield washer fluid or just water in the washer reservoir can represent a true safety risk,” warns Kunst, the DEKRA expert. The solvents in winter washer fluid, which are designed for frost and deicing, are either relatively or totally unsuitable for this – and they frequently leave behind a dangerous film of lubricant. The summer mixture reliably combats the types of debris that typically build up in the summer months, which tend to include protein-rich insect residues. “As we enter the spring and frost abates, drivers are recommended to switch over to summer windshield washer fluid, since the composition of debris on the windshield in the warmer months changes a great deal,” says Thilo Kunst, a vehicle chemistry expert at DEKRA. If dirt or water stains on the windshield hinder visibility, this can impair drivers’ concentration and increase the risk of accidents, warn the safety experts at DEKRA. Drivers must have a clear view in every situation.
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