While at a Salvage yard recently,I was trying to remove some pulleys from an engine.I couldn't get the bolts to move,so I asked the attendant if he had any WD-40.
He comes back with something called
AeroKroil,that quickly freed up all the bolts as well as other items on the engine.
I was so impressed with it,I wrote the contact info down...
HERE.
This stuff is like WD-40 on Steroids!