Muriatic acid works. That is what the paver folks use when resealing pavers. Not sure how the previous poster tried to apply it, but I use a 50-50 mixture of muriatic and water. Pour a small amount on the stain, then rinse within 5-10 seconds. If you leave it there, it will discolor the paver, and may turn out to be more noticeable than the rust was! Repeat the process until the stain is gone. Sometimes this takes 4 or 5 cycles.
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