How can you remove "sooty" stain from carpet around floor molding?

+6
Answered
We're not sure of the cause of this "sooty" stain on carpet. It is located around molding of upstairs bedrooms (soot from teenage daughters' candles, maybe?). Multiple vacuuming with hand tool (Rainbow) and cleaning with carpet cleaner is not removing stain. Any ideas?
q how can you remove sooty stain from carpet around floor molding
  9 answers
Your comment...