The Crockpot and antifreeze is a terrible thing to subject the inside
of your precision engine components to. The internals of your engine
aren't the same as the insides of your radiator.
What's just as stupid is to let the poor engine stew in this mess for
several hours just to clean some baked on castor oil off. Only an old
demented field geezer would suggest this as a solution to cleaning crud
off the engine. I'd make him brush his teeth with it!
If you use a full-synthetic fuel, you escape most of the problem. Also
when you come home from the field, cover the carb inlet and exhaust
with some rubber cups (Tower has them), give the engine a shot of a
degreaser, and rinse it off with hot water. Make sure you dry engine
thoroughly (hair dryer works well).
Finally, if you can't get the crap off, spend a few cents for some
Demon Clean (see my previous post).