Noticed these dark grey bands forming along the edges of the carpet in every room near the baseboards. We don’t wear shoes inside, but the perimeter keeps turning black no matter how much I vacuum. Is

use specialized cleaning agents or pre-treatment solutions to target filtration soiling specifically. It’s important to hire reputable cleaning services with experience in dealing with this particular issue to achieve the best results.
8. DIY Cleaning Techniques and Products That Actually Work
For those inclined to tackle the problem themselves, there are several DIY techniques and products that can help lighten filtration soiling. A mixture of baking soda and vinegar can be applied to the affected areas, left to sit for several minutes, and then scrubbed with a brush.
Another effective method is using a carpet cleaner with a high-efficiency particulate air (HEPA) filter, which can capture smaller particles more effectively than a standard vacuum. Be sure to follow any DIY cleaning with thorough vacuuming and allow the carpet to dry completely to prevent mold growth.
9. Preventive Steps: Sealing Gaps, Improving Filtration, and Managing Airflow 
Prevention is key to avoiding