The product he's talking about is actually called "CLR"(Calcium, Lime and Rust). I vote to use the Razor blade, I've done it before and it get's it all off... I probably wouldn't use hot water at first, just so I could see what I've gotten and what I've missed.
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One Reef to rule them all, One Reef to find them, One Reef to bring them all and in the Depths bind them.
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