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@lae
He means roll it inside itself along its length - like the way you would roll a Swiss Roll.
Caustic soda will always work on an aluminium seatpost, given enough time. It might take a week, but it will dissolve the aluminium. Mix up some strong solution and top it up regularly, and wear some proper safety equipment. Perhaps mix a solution of the same strength and deposit a piece of test-aluminium in it to see how it's doing...
Be careful not to get it on the frame as it'll damage the paint.