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According to MSDS, they are similar compound to Naval Jelly, but Naval Jelly is readily available at half the cost. I prefer Kroil as it is oil, especially if it's newly formed rust, but they are...

Mechanical methods would be the last resort in my book. Soak with Kroil-Oil (you'll pay for it at Napa - Midway USA is fairly cheap...great penetrating oil) and surface rust should wipe right off....