PB blaster, that's the stuff...... My garage is naked without a can of that stuff around...
After breaking a bolt off for the water pump on the z.....I used pliers, vice grips.....you name it.... there was a small tit that I could barely get to...... someone told me about that stuff, so I got some and put it on....let is set for a while.....and voila... it came out with a pair of regular pliers.... that stuff is amazing...