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Science of Baking
Zinc has to be heated to several hundred degrees, maybe around 400 F, to to form dangerous fumes. Remove the zinc galvanizing by soaking the hooks in muriatic acid for about 30 seconds to a minute. It is about $7 a quart at ACE hardware. Do this outside as it makes fumes. I cleaned galvanized lawn steel edging this way to get plates for my smoker and grill. The grease coating completely protects the metal from rusting. Works great and your hooks should too.