Make sure to always wipe the frame after washing the floor to avoid stains.
Stain Removal
Dust, dirt and grease: Wipe clean with a soft cloth firmly wrung in hot water containing a mild cleaning agent. Marks from shoe polish/rubber: Wipe clean with a soft cloth firmly wrung in hot water containing a mild cleaning agent. On tougher stains, you may use methylated spirits or cleaner’s naphtha.
∆ Please note that you should NEVER use chlorine-based liquids on steel, as this will cause corrosion, and NEVER use wire wool as this may cause discolouration.