Isn't that ammonia?

I recently successfully used ammonia to free up a heavily oxidized stem and a seat post too, as ammonia dissolves aluminum corrosion, but leaves steel and aluminum well enough alone. Over a week and a half I first used penetrating oils and then ammonia, and judging from the corrosion on the aluminum posts, aluminum oxide was the sticking point. I used ten and twenty pound weights as impact hammers. After a few days of ammonia, both started to move and the game was won. There was evidence on the posts of dissolved corrosion, but not of penetrating oil. (Sure, the ammonia may have rinsed it away.)

I know Sheldon suggests this but I've not read of anyone having any success with this approach.

It worked for me?



(Both the seat pillar and the stem emerged in functional condition, which really didn't matter too much as they are not of any significant interest. The frame, however, is very interesting and unscathed and so far, enigmatic and unidentified.)