On engines that have serious gunk my proceedure is as follows;
Coat everything with a good degreaser and let soak for 10 minutes. Using high pressure water spray the really bad places and hit them hard and close. The shear pressure and the velocity of the water will knock a goog majority of the stuff off. Hit things from all different angles to get it all off. Jack the car up as high in the air as possible and spray from the bottom side.
Never ever spray directly at any of the following components;
1. Electrical connectors of any type.
2. Any electrical component.
3. Ignition wires, spark plugs and distributor cap.
4. Fluid reservoirs such as brake, power steering, hydraulic oil etc.
Repeat as necessary to get a sparkling clean engine.
If the engine does not start, you should make sure there is no moisture or water on the ignition wires and on the inside of the distributor.
I got too many cars!! Insurance eats me alive. Dave
78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k