Keep powder-coated surfaces clean and dry.

Light cleaning of smooth and rough powder-coated surfaces
For light cleaning of e.g. grease stains, use a lint-free cloth or a soft brush with glass cleaner. Wipe off with a lint-free cloth. For heavier cleaning, use a lint-free cloth or a soft brush with warm water and a mild detergent. Remove rubber parts to ease the cleaning process.

Lime stains
For removal of lime stains, use a lint-free cloth or a soft brush with glass cleaner. Then soak the surface in vinegar/cover it with a vinegar-soaked piece of paper towel for 30-60 minutes. Finish by rinsing with lukewarm water. 

Outdoor powder-coated surfaces
Keep powder-coated surfaces clear of debris like bird droppings, mud, and leaves to prevent damage. Clean with warm water and mild detergent using a lint-free cloth or soft brush. Finish by wiping dry with a dry cloth.