Go to walmart and get a 5 gallon bottle of "PURPLE POWER" for about 5 bucks... get a spray bottle, and spray the entire engine, let it soak for 5-8 mins, then get a soapy soultion and wash the engine with a cloth or brush....
turn the engine ON!!
before rinsing, make sure the motor is running, before hitting it with water.... this will avoid any problems!! I forgot to say in my previous post, rinse the engine with it ON!
RINSE it really well, it will be okay once the engine is running... all electrical components are grounded to the engine block!!