How Can I Remove Spots From Enamel Covered Cast Iron Cookware?
 KOHLER PORCELAIN ENAMELED CAST IRON WHIRLPOOL TUB 856H2  US $142.50
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 PRIZER WARE ENAMELED CAST IRON pan with cover Vintage US $9.99
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It looks like water spot stains. But they won't wash off with soap and water .
Use a liquid car polish (rub on, let dry, buff off). It’s great for all enameled surfaces, including stove tops.