Penetrating liquid

What’s the best stuff to get stuck Aluminium parts out of a steel frame?

I have read Ammonia if it is Ali stuck in Ali, or should I just go to A Big Chain Hardware Store and ask for the Aussie version of ‘Liquid Wrench’?

well the all time best used to be stuff called ‘Penetrene’ but I think they changed the formulation sometime. The old stuff is ‘Generator’ to ‘Grey Race’ if you will…

Some people swear by WD40 left overnight, others say ammonia is a dish best served cold. I still use some Penetrene and a big serving of grunt.

stem quill stuck in forks
this may help?