In the uk try this one www.morrislubricants.co.uk/ - penetrating oil very effective and reasonably priced
If you like Aero- Kroil try Sili-Kroil. It has silicone in it and it works even better. We probably use a case a month.
I have tried the 50% Acetone/50% auto trrans fluid and like it. I mixed a pump oil can full and use it often.