Cleaning little castor oil baked model aero engines to restore , they throw them in a crock pot of Anti-Freeze (car radiator)
and boil for an hour . say they come out like new .
Could drop youre whole engine in a 20 litre drum of it .
ATF , heat cycleing could help , if the suns out ? into the miday sun for a 1/2 hour , into deep shade for an 1/2 hour , alternateing a good few times .
A blow lamp & a fire extinguisher miles from anything inflammable if youre in that much of a hurry .
Engine rebuilders have ' Hot Tanks ' , HAS to be suiutable for ALLOY , or itll disolve .! ! ! :shock: :cry: :wink:
a bit expenseive , but preferable to brute force and ignorance .
Down on the farm theyd dump it in a 50 Gal drum of Diesel for a season . :wink: :|