How to Properly paint and gunk engine?

If you were to ask me, I'd tell you to avoid Duplicolor paint at all costs. I've never had a bit of luck with it. Be it body or engine.
Interesting...Some Dupli Color products,really are bad..(overpriced touch up paints,lacquer based,... ,touch up bottles,that dry out...) The rattle can etch,the engine paint cans(Ceramic 500 degree ,based...,The Wheel paint(actual catalyst enamel!) are good... Shot the "Paint series " lacquer,it's fair... At 26 bucks a quart,I picked up 44 dollar a gallon Acyrlic urethane,in Sublime.. I sold this junk,for twenty years,& using as a hot rod quarterback hobbiest..Karl has some truthes,to his post. For what it's worth: You can get color matched factory paint,mixed in a rattle can.It's real car paint,mixed from paint banks..It's not cheap(30-40 bucks a can..), but an option for some jobs....
As for cleaning: 50-50mix, of HOT water (90-100 Fahrenheit),& and Simple Green.I usually use low water pressure with an adjustable orifice hose nozzle(or your thumb..), to rinse off.. Sometimes anything caustic,removes more than what you want....