If your stainless steel handrails are showing rust, it could be due to several reasons such as exposure to saltwater, prolonged exposure to moisture or humidity, or using cleaning agents that contain harsh chemicals. Here are some steps you can take to remove the rust and prevent it from recurring:

1. Clean the surface: Use a mild soap and warm water to clean the surface of the handrails thoroughly. Make sure to remove any dirt, debris, or other contaminants that may be present on the surface. Rinse the surface with clean water and dry it completely with a towel.
2. Remove the rust: Use a stainless steel rust remover, such as a paste or liquid, to remove the rust from the surface. Follow the instructions on the product label carefully, and wear protective gloves and eye goggles to avoid any contact with the product.
3. Buff the surface: Once you have removed the rust, use a buffing pad or a clean cloth to buff the surface of the handrails. This will help to restore the shine and smoothness of the surface.
4. Apply a protective coating: Apply a protective coating, such as a rust inhibitor or clear coat, to the surface of the handrails to prevent rust from forming again. Follow the instructions on the product label carefully and allow sufficient time for the coating to dry completely before using the handrails.
5. Maintain regular cleaning: Regularly clean and maintain the handrails to prevent rust from forming again. Use mild soap and warm water to clean the surface and avoid using harsh chemicals or abrasive materials that could damage the surface.

By following these steps, you should be able to remove the rust from your stainless steel handrails and prevent it from recurring in the future.