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?

Asked by for the 2009 Lexus ES350
since it's in factory warranty, was curious what the dealer says about this???
Overbys Inc,
Could you contact me with your e-mail, please? I have a question for you. My e-mail:
zeekerekes at