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It's in the neck of the filler.But the mesh sometimes gets clogged, & you can't fill the bottle. prize the filter out with a screwdriver & soak it in washing up liquid, then gently scrape off all the algie & gunge from both sides of the mesh. you must get it all off otherwise it grows back !!!!

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11y ago
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Q: Where is the washer bottle filter on Audi A4?
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