Originally Posted by
Sport_Pilot
For gas engines yes, but not for glow engines. Use methanol to remove congealed castor oil. To remove baked on castor varnish use antifreeze warmed in a crock pot, or oven cleaner.
Antifreeze works pretty good but it can't be the premixed Antifreeze, it has to be the concentrate, it has a certain ingredient in it that the premix doesn't have.