What causes dirty marks under doors and along skirtings?

October 23, 2011 Facebook Twitter LinkedIn Google+ Consumer Advice

Filtration soil may appear as dark or grayish lines on carpet along walls, stairways and under doors. It is caused by airflow over and through carpet, allowing fine soils to settle on the surface. It is often caused by an improperly balanced ventilation system, when the volume of air entering a room exceeds the system’s capacity to remove air from the room. Excess air then seeks exit sources in gaps along walls and stairways.

How to minimise filtration soiling

  • Prevent the airflow through carpet and carpet edges by sealing openings through the carpet and under doors and skirting
  • Keeping the air in the area clean and using good filtration in your heating and cooling systems and vacuum cleaners can help
  • Filtration soils may require special cleaning treatment for effective removal
Many carpet cleaning companies don’t clean carpets right up to the skirtings, leaving dirt and microbes from the air resting in your carpet pile until the next time the air pressure in the room changes and this dust is blown back into the room. 
You can be assured of a quality carpet cleaning service from our members across the UK. Find your nearest member using the postcode search at the top of every page on our website.


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  1. Peter said on February 27, 2013 2:12 pm:

    Is there a way of removing cementicious residues from a high quality woollen carpet