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@AmercianBoy
Interesting comment about Coke (other colas are available). A friend of mine also got his seatpost out using coke.
Coke contains phosphoric acid and whilst not very strong, for some reason it's really good on steel. When I worked at a British Steel lab, they told me that the best acid they had found for dissolving steel samples was a mix of 45/45 hydrochloric / nitric (for strength) and 10% phosphoric acid (to "get the reaction going").