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Q: Very fine white power from dash-board vents on 2009 Lexus ES350

I'm getting a very fine white power appearing on my dash. I thought it was dust, but when I wiped it away it seem to smear like a powder substance. I changed the inside cabin filter and wiped the dash clean, but within a day or so the powder re-appears. What can this be? Any suggestions for solving this problem?
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Overbys Inc,
Could you contact me with your e-mail, please? I have a question for you. My e-mail:
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