Black "V" on glass

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thepaulmc

Member
Jan 2, 2012
83
Pocono Mountains, PA
I have a 25-PDVC and 30 mins after cleaning it I have a big black V on the inside of the glass... Any ideas on what causes this??
 
My Whitfield has dirty places on it shortly after cleaning. I think the places are caused by the way the air flows around the airwash. In my experience with the Whitfield this is perfectly normal.
 
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