Removing stuck or seized seatpost?

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tbc
Left this fizzing away this morning.

Returned 9 hours later worried the whole bike would have been eaten. However the seatpost is still there and still fizzing, though it's changed colour. Keep waiting? Up the dosage? Try another method?

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Scilly.Suffolk in reply to @tbc

I've had a bottom bracket sat in Caustic Soda for nigh on a week now.

If it's fizzing, then it's still active: change the solution after a couple of days.

Can you get any down the seat tube to attack it from the other end?

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