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I don't know about the molasses one, but I tried this one and it works-
https://board.moparts.org/ubbthreads/show...part=1&vc=1
I used two gallons of vinegar and the right amounts of salt and lemon juice, I put it in a big plastic tub. I was able to clean quite a bit before it seemed to loose effectiveness. One tip, I'd let the stuff soak for a couple hours, then pull it out and use a cheap paint brush to knock the sludge off. It seems likeit speeds it up a bit?

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This mixture works great. I mix it up in a 5 gallon bucket, about 3-1/2 gallons at a time. I seems to have a very long "shelf life" and I have cleaned a lot of parts without it losing much strength. I let stuff sit anywhere from 24 hours to 2 or 3 days when the weather is much cooler. I dont think it could get more cost effective for rust cleaning