I can say one thing. IT WORKS!
I followed someone's instructions on this board almost to the letter, and am having the same results. I'm currently cooking/cleaning a 16 year old FP .35 that had not only has baked on castor oil, but the alloys themselves have grown tarnished looking over the years.
I simply removed the engine's backplate and glowplug and dropped it into a old, never to be used for food again crock pot with a 50/50 mixture of antifreeze and water. I kept the setting on low.
Within just two hours the engine's casings were looking nearly new again, and the baked on castor oil would come off just with a scratch of finger nail pressure.
By morning the engine should look brand new again!
I forgot the guys name who orginally posted this idea, but neverless I must thank him for the superb advice. This method works fellas!
PR