Jim_Gruber
Yoda

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Yes a big enough kid's pool and you could do it. I'm sure someone on this list has tried this technique with a complete shell. It's just washing soda,can buy at Wal-MArt. Same stuff you put in the washing machine. Strain off the big chunks and rest can go down the drain. No acid involved here. Check the WIKI Here or Google Electrolytic Rust removal for more details. Usually done with smaller parts but technique could be scaled up for bigger stuff.