That technique involves electrolysis, you can do it to any steel part you can fit in your "tank"..However, if you wire it backwards, you will end up making it worse. I used it on motorcycle gas tanks frequently. I used muriatic acid instead of soda ash, but any strong acid or base will work..You'll need another piece of metal in the tank where you connect your other terminal for the rust to move to. I don't remember how I wired mine, its been about 4 years, and the battery charger I used had no indicators of polarity..I used a rusty bolt and a clean bolt to test it, and I wired it right the first time..I did test the polarity before dipping a fuel tank, but I forget what it came out to be. IMO, for items you can sandblast, I'd sandblast em instead of removing the rust via electrolysis..its faster and safer..the inside of motorcycle gas tanks are rather difficult to sandblast...
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