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Keep shopping the vinegar price if you think that's the way you want to go. And there are better prices on citric acid if you hunt a bit. The difference with citric acid is you can create any percentage solution you want. I've seen it sold in 50 pound bags for around $140. 50 pounds will make a LOT of usable citric acid solution. 1 tablespoon in a pint of water will make a 6% solution which is weaker than you might need for faster action but a good starting point and a formula that will let you calculate other percentage levels...ie 2 tbsp in a pint will give you 12%, etc. There isn't really much wisdom in preparing a large dip tank for a citric acid solution, though. You'll waste too much. If you could put the rusty parts into close-fitting plastic bags, that would be ideal. Good luck.