Powder coated refrigerator doors scratch as soon as anyone looks at them. When the stain is gone dip a clean white cloth in plain cold water and rinse the area to remove all cleaning.

Powder Coating On Wood Powder Coating Institute
How to remove stains from powder coat. Blot or lightly scrub the stain and blot with a dry paper towel to absorb the moisture. Low pressure should be used for pressure cleaning powder coated surfaces. Hard water stains can be removed by. Spray the hard water spots with a lime scale remover that is high in phosphoric acid. The weathering of the coatings may vary depending on the circumstances in which the powder coated item is used. A powder coating polish has a light abrasive formula that will actually scratch the surface very lightly to scrape the stain off of the surface.
Here is a procedure to remove surface scratches from powder coated refrigerator doors. Use filtered water only for this purpose. Water can sometimes get on a powder coated surface and then evaporate. Removing stains are the damage which is caused to the powder coated items due to the exposure to the elements and it results in slight change in the color of the product missing of the perfect gloss finish. Especially by the usage of hard water on the coated product. An acid based cleaner works well for hard water spot removal.
Apply a dab of polish about the size of the stain and rub it in a circular motion to remove the stain. Both are great for powder coat removal from as quick as 15 minutes 2 hours or overnight depending on the type of coating being removed. Stains and discoloration on other objects are a sign you will likely have to deal with the same on the powder coated surfaces if you use the same water. Terry cloth and microfiber. After it evaporates the minerals in the water remain on the surface forming hard water spots. Spraying a small amount of lime scale cleaner on the stains and waiting for 15 minutes for the cleaner to work and wipe the extra solution off the surface with a soft cloth.
The stains over powder coated material can be caused due to water. Another great powder coat chemical stripper is miles remove 9000 you can get here dipping application or miles remove 9001 a gel version applied with a bristle brush.