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@Husy
Sodium Hydroxide is obviously corrosive. But just like anything, if you do a good job (which isn't hard) it won't do your frame or paintwork any harm. If you soak your frame in it for a while it will.
You cut the top bit of the seat post away. You then block the bottom of the seat post with a cork or bung. Pull some inner tube over the outside of the seat tube and mask over the frame around the seat post. Small amounts of Sodium Hydroxide at a time, turn the frame upside down to pour it out, will take half an hour.