I used to swear by PBblaster until I tried
Kano Labs Kroil oil. Check out http://www.kanolabs.com/.
It is better IMO - you have to be a company to order it - for home use I'm "firstname lastname and associates" (which is actually a company sometimes).

If you try an easyout get a lefthand drill bit. If either break off you are basically done unless you can weld something to the leftover piece.