Recently I've had very surprising success with undiluted windex. When you buy the "industrial strength" stuff in a big bottle you're supposed to dilute it with water before using, but if you use it straight it seems to work quite well at removing rust. I assume it's the ammonia or some other cleaning agent doing the work. Also of note, when you wipe the windex off the rust on the paper towel is brown whereas if you use something acidic like coke the rust on the towel is black.
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