Doesn't. You can do almost nothing to hurt a cast-iron pan itself. It can destroy your seasoning, though, and require you to "fix" it by thoroughly cleaning an

Doesn't. You can do almost nothing to hurt a cast-iron pan itself. It can destroy your seasoning, though, and require you to "fix" it by thoroughly cleaning and re-seasoning it. It's not that difficult, but generally you want to retain your previous seasoning as it's much easier and it gets better with time. People also think soap and water "damages" cast iron, and that's not true either. http://www.seriouseats.com/2014/11/the-truth-about-cast-iron.html http://www.seriouseats.com/2014/11/the-truth-about-cast-iron... Anyway, prolonged rusting or breakage are the only ways to "destroy" cast iron.