Run a hose from your hot water heater drain with a good spray nozzle. Be prepared to protect yourself from back splash. Use that purple power cleaner stuff and don't let it dry on the parts. Also use a bunch of various sized brushes from Harbor Freight, remove all the plugs and physically scrub every surface of the engine inside and out including all the oil galleys. Oil the bores and crank saddles with a rag right away unless you are going to hone etc,