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There's another product out there that does real well. caustic soda and usually comes in beads you mix with water. At 75% strength it will take all the edges off car keys in under 5 minutes. Not that while working around a 500 gallon tank of the stuff the keys to my silver GT fell in and had to be fished out in a hurry or I was walking home. Takes off chrome in about the same time. We used it as a chemical polish for stainless and titanium parts. On them it took about 1/2 an hour.
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