After the mention of Acetone & ATF in the recent thread on Kroil. I found this in Wikipedia. Acetone can also be used in combination with automatic transmission fluid to create an effective penetrating oil. Brake fluid is sometimes used in place of ATF. These mixtures (usually 1:1) can be useful in loosening rusted or stuck bolts.
When I was in college in the early 60’s I worked for Goodyear @ the Dallas Transit Bus system. They used Brake Fluid as a penetrating oil to remove the lug nuts. A large 1” drive Air Impact was used to accomplish this. It was also used reinstalling the nuts. I know that brake fluid does penetrate/wick into very fine cracks. I also know that Brake Fluid appears to cause steel to rust.
Does anyone have any thoughts on the Acetone-ATF or Acetone-Brake Fluid as a penetrating oil.