To clean up these stains you need water and vigorous scrubbing.
Dirt around edge of carpet.
Filtration soiling occurs when there is an imbalance in the air ventilation of the room.
Dark dirt marks around the edges of your carpet are caused by an issue called filtration soiling.
Filtration soiling is pollution that comes from dirty ductwork and settles on your carpet.
This will help release any trapped dirt dust or debris.
You can find evidence of filtration soiling anywhere airflow is restricted near carpeting.
Along the edge of walls where the carpet meets the wall.
This soiling is called filtration soiling because it comes from air passing through the carpet as it is attempting to get through the crack between the.
As the air is forced through the ventilation system it picks up whatever dirt is in the ducts and carries it into the living areas of the home and thus potentially into the carpet.
Along the corners of a room.
Let the carpet dry then vacuum again to remove any surface dirt and loose fibers that remain.
While your carpet edges are still damp use your carpet edge cleaning brush toothbrush or grout cleaning brush to scrub the carpet.
The black lines are a result of filtration soil.
Make 2 3 passes along the skirting boards with your scrub brush.
You can also use a dampened white rag to scrub your carpet edges.
The first step to preventing filtration soiling is to be sure that your ducts are clean.
Along the edges of carpeted stairs.
Start with the hvac system.
You may need to use detergent for more persistent stains.
The carpet acts as a filter gathering the dirt from the air.