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2015 ES350 Seat Odor

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I have a 2015 ES350 with 8,500 miles, but a strong, chemical odor in the cabin. The Lexus dealer said to have it detailed and change the cabin air filter, which did not help. I had the carpet and sound insulation replaced (~$2500) and put an ozone machine in the car for a week.  The odor is clearly coming from the seats. I left it in the garage for two weeks without cranking, and now the garage smells like that chemical, so it doesn't appear to be related to the A/C or engine. The Lexus dealer looked at it three times and said to contact corporate to get a field engineer inspection. Lexus Corporate said it was not covered under warranty (I have the 6-year extended), and that they could not help me. They suggested I try a different dealer. I can't be the first person with this problem. Any ideas? Thanks!

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