The carpet acts as a filter as air passes through it. Fine soot, dust, cooking residue, smoke, and other particles accumulate slowly along the edge. Routine vacuuming may not fully remove the embedded soil. Specialized cleaning can improve the appearance, but sealing air gaps and improving filtration may be needed to slow recurrence.

Key considerations

  • black lines around carpet edges
  • carpet filtration soil
  • dark carpet near baseboard
  • filtration lines carpet
  • dark carpet edges
  • airborne soil
Ask an Expert