Rob, I'm just looking to try it. I've done electrolysis - works fine. And I've used Evaporust. It also works fine, but I don't like how it smells. It's non-toxic, and doesn't smell much, but I don't like the odor. Also, it's kinda pricey. I'm not sure how long it'll last, but so far, I've done a number of small items with a quart.
I've heard about citric acid, and was getting curious. FWIW, I paid about $3.39 for 5 oz at a bulk food store. 1 or 2# bags seem like a better value, I didn't know it came that way.