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An alternative could be transmission oil (low viscosity) + acetone, also 50/50.

Here's a guy on youtube showing how to make it and a comparison to other brands (the diy turned out the best):

https://www.youtube.com/watch?v=2WuVBFTzoKc

Seconding this - this is some excellent stuff for rusted suspension nuts and bolts and things like stuck mechanisms. Just make sure to shake well before spraying as acetone likes to separate. If you have atf thats died red make sure it comes out pinkish.

I stand by tranny fluid + acetone. That and the old heat it and beat it

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