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

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