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Our dealership has a big deal at signup about never using RainX wash, or others w/ that additive (silicone?). It will kill something in the pump, an O ring I think, and shut it down. Here they fixed these under warranty (perhaps not after the warning, but that doesn't apply to you who got no warning). This sounds more likely than algae, and you should be able to see algae real easy if that is the problem.
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