The only thing I haven't tried is a small propane torch on the nut of
the rears and the wheel/hub of the fronts.

Any and all thoughts would be helpful.

btw, I have a 1/2" Ingersoll Rand impact gun running 140psi, and have
used it with gunk-off or whatever that stuff is called to no avail.

any and all thoughts are appreciated.
sudhir