Homemade Penetrating Oil

[NortonDommi]

I've been trying all-sorts for about forty years and the best I've come up with is 50/50 ATF and Kerosene. I don't know where the Acetone came frome it seemed to crop up about ten years ago.
I do various testing and one is to use a piece of rusty plate, place drops with a pitot and measure at ten minute intervals over an hour,(beer helps). Then check a few times the next day. The Acetone mix falls short of many mixes due to the Acetone evaporating.
The Kero mix can have a bit of Aliphatic thinners added, ( about 20% to the mix), for slightly increase speed.
I wasted money on Kroil once just to see how it compared. I stick to the ATF/Kerosene.

Speaking of rusty stuff heat and a candle for those 'just won't move' nuts and bolts and 40 - 60: 1 water /mollasses for soaking,(degrease first).
I save old tools and machinery for a hobby and while I am always looking for a magic bullet the above get the job done.