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Hard water can leave mineral stains on your stainless steel appliances, most often in the form of streaks, blobs and rust marks. Stainless steel is designed to be easy to maintain, and you can remove these marks with minimal effort, provided that you have the right materials.
Blue or Green Stains: Copper. Copper is seldom naturally present in a water supply, and usually results from the corrosion of copper plumbing. Signs of copper contamination in a water supply include: 1  Blue or green stains on showers, sinks, and other plumbing fixtures.s little as 0.3 ppm (parts per million), is enough iron to cause staining. Over time, this iron will react with water and air in a process known as oxidation and form rust, turning relatively new plumbing fixtures into eyesores and shortening their useful lifespans.