Originally Posted by
elguicho
Really? That's the kind of easy idea I was looking for. I want to try all the non-violent methods first otherwise I guess I'll get the saw out...
Windex and most glass cleaning solutions contain ammonia. Others suggested ammonia above and I've used this before with exactly your problem, although I think the liquid did more lubrication than ammonia did clearing the oxide layer. I still ended up with big scratched seat post after muscling it out. If the seat post was stuck in a steel frame, I'd recommend using coke/pepsi and letting it sit all night. It contains phosphoric acid which reacts and loosens rust. I guess know your chemistry and read labels on household products!