Probably- - - - -but it will also strip paint- - - - -particularly if you boil the solution. I'd suggest cutting the posts off and drilling or reaming out the remains of them. You could also thread the posts with a big tap and use a slide hammer to remove them.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!