Hard water scale on heating elements, tried vinegar, then this worked

Had a customer in Wichita with a water heater that kept tripping the high limit. Pulled the element and it was caked with about a quarter inch of white scale. Vinegar soak softened it but didn't get it all. Tried a citrus descaler from the hardware store, still left chunks. Finally grabbed a plastic putty knife and scraped it off dry before the soak. Worked in ten minutes flat with no damage to the element threads. Has anyone else found a faster way to break down that rock-like buildup without replacing the part?

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