Take the Acetone/ATF mix and add kerosene (1/3 Acetone, 1/3 ATF and 1/3 kerosene).
See Coolerman's website at Ed's Red Penetrating Oil
I'm working on a restoration now and have been using it along with WD40 and PB Blaster (get the cheaper PB Blaster in 1 gallon cans plus you get a metal spray bottle that won't leak like the plastic ones). It works good as an undercoating spray as well just to keep everything coated. I put in some lanolin as well even though I use gloves. Melt the lanolin in a microwave to get it liquified before you mix it. It's still not cheap but is less expensive than Kroll or PB Blaster by the gallon.