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They are virtually impervious to acid rain, and petroleum products like RainX. They can last 5-10 years before needing replacement. They are very expensive and quite rare to find, but worth it. (i think $35-50.oo)I personally use one of the three AutoZones models. They are essentially all the same. The rubber compound turns to crap in acid rains, and very quickly if you use rainx type products. but at $12.-$20 a set, they are easily replaceable every year or so, and readily available.
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