Purchase a steam cleaner at Walmart.com or Harbor freight for about $100 bucks before discount. McCulloch steam cleaner. Cover distributor, generator, alternator or other electrical components first.
Dawn dishwashing liquid. Cleans grease off ducks, cars and hands very well.
Purple Power. Easy Off. Simple Green.
MINERAL SPIRITS as shown in this video below:
https://youtu.be/jttcGiGPzR4