By standing in the center of the step, holding the handrail when possible, and keeping loose clothing and belongings away from moving parts, passengers can help ensure a safe and comfortable ride.
Conclusion:
The brushes on the sides of escalators are not decorative and are not primarily for cleaning. Their main purpose is to encourage riders to stay away from the edges, helping reduce the risk of clothing, shoes, or personal items becoming caught. It is a simple but effective safety feature that most people never notice until someone points it out.