check out my website under engine detailing.....
On OEM engines..meaning mostly plastic engines, i hit it with a half and half degreaser. I then stand pretty far back to lightly hit the engine with water. I then cover the engine with AA tire foam. I dont like AA alot but it works great for this. I let the engine run for about 5-8 minutes while i start washing the car.
www.scottsdetail.com
and check out my photography website while your at it.....
www.scottscam.com