OK This info is if you don't particularly like doing the "crockpot" senario, or paying big bucks for demon clean. If you want the "same" contents as demon clean or z-best then go to you local auto accessory store, PEP Boys, AUTO Zone, etc. And get an item called "Aircraft Remover" made by Klean Strip. The price may vary in your neighborhood but your talking about $6.00 for a pint, that's 16 oz. to play with. Why I like it is that it's cheap , it works, and if you want to take a little burnt-in castor off your engine, all you have to do is brush it on and wait about a hour or so and rinse it of with cold water. This stuff is potent so be sure to wear some latex gloves.
Steve