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Regarding the shoes - and socks. Molten metal is understandably dangerous, and the Rule is, if it can happen, it will. Wear boots that your jeans can cover the tops of. From personal experience during my youth, weld spatter bounced and landed inside my low-top leather shoes. I still have the scar. Cotton socks will char. Polyester, or any synthetic, will melt - into your skin, compounding an already bad situation.Even for small pours, we pour a ring of sand around the mold beforehand. If the mold leaks, it's stopped before you become tethered to a wheelchair.
Just bake it. Most people can't buy hydrogen peroxide at that concentration anyway. Any temperature between 225 and 400 degrees is fine. Peroxides leave nasties behind. Steam regeneration is common but they go up to 900 with a controlled cooldown. It stinks, so winter isn't the best time to do it.