That is just a pain in the butt way to clean a sludged engine.
Pull the valve cover and oil pan. Mask off the engine compartment with plastic, and grab the pressure washer (better yet get your helper to use the pressure washer). Blast it clean. Rotate the engine a couple of times to get all sides of the crank and cams, blow dry it, clean the oil pickup and reassemble. After its done, take your helper out back and hose him off.