Help needed with Stuck parts

I also have a stuck seat post and am just about to embark on the ammonia route, how did you administer the stuff and how long did you leave it to work on the oxide, also where can you get the ammonia in the first place. (I have a lot of faith in Sheldon Brown's advice and he appears to have liked this method) Also how did you use the Coke method since this sounds attactive but not as potent as the ammonia
Regards
Br

Hello,
I poured the ammonia in from the bottom bracket shell, after the bb was removed obv... left it a week and no progress, giving it a second shot, for a second week with a fresh application...
Same with coke... trying coke out again on the stem now as thats stuck too, just reapplied both, which will work? prob neither. I hate people who don't grease things...
I got the ammonia from a hardware store by Barbican, was less than 3 quid a bottle...
Caustic soda is looking more appealing every day, skip the "mild routes" and grab the bull by the horns, saves you a lot of time in the long run I think...