The answer to 'spider trails' is that spider trails are typically caused by spiders leaving behind silk trails as they move around. These trails can appear as thin, wispy lines on walls, floors, or other surfaces. The most common causes are spiders searching for food, building webs, or moving to a new location.
Spider trails are generally not a sign of an infestation, but they can be an indicator that spiders are present in the home. The best solution is to remove any cobwebs or webbing you see, and use a vacuum or broom to clean up the trails. If you continue to see a significant number of spider trails, it may be time to call a professional pest control technician to assess the situation and recommend appropriate treatment.