rust belt guys:
I have about every kind of penatrating oil made.
some of it is even colored brown to make you think it is working.
the ONLY one that I have found that actually works is called
enforce, it is in a green can. my local napa carries it.
on the steering arm I was trying to get off, I sprayed it on one side and with in 45 min it appeared on the other side. some firm taps and it came right off.