Powder coatings on metalwork are usually quite resilient, but they can lose gloss, discolour slightly or become chalky. Even without these effects it is always a good practice to clean installations of grime, dirt and grease.
Warm water and a PH neutral detergent is always a good starting point when cleaning powder coatings. Avoid anything abrasive. Use soft cloths, sponges or brushes with very soft bristles. Powder coatings can be cleaned in much the same manner as windows. Always rinse with after cleaning with detergents so as to remove any residue. It is best to wear rubber gloves.
That was part 1 of a two part tips for maintaining and cleaning metal. Part 2 can be found here:
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For more information, feel free to visit their website.