I replaced a leaking valve cover gasket and I also intend to replace the pushrod cover gasket. (300cid/6cyl) Over the life of this engine(27yr) a build-up of oil/grime/junk has accumulated. I used to pressure wash it occasionally, but.....I slacked off some. Any recommendations for a strong degreaser that will loosen/melt this gunk? I have a pressure washer/1700psi...cold water only. A steamer would be good, but, no got! BTW: valve train is black, but not a hint of sludge/junk. Thanks
Dave S(Texas)