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Kohler Whitehaven Cast Iron Sink Discoloration

Roxy Roxy
last month

It’s been less than a year since my new Kohler Whitehaven Cast Iron sink was installed. From the day one it was cleaned only with a Kohler Cast Iron Cleaner and a stainless steel rack used to avoid any scratches or damages. Recently during my regular sink cleaning, once the sink was dry I noticed multiple colorless, matte stains on the sink basin. The stains won’t go away after using the above-mentioned cleaner, soda, peroxide, dish soap and vinegar. I wonder what these discoloration is and what could have caused it. Has anyone had anything similar?

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