JMO.....To TRULY flush your engine you need to run it on "after run fuel". I just don't believe that spinning it with a starter, regardless of what is sprayed/poured in it will get everywhere that actually running it will. Also, building heat removes moisture more effectively. Make up a batch (maybe a quart) of methanol with at least 30% oil. Use a pure synthetic or at least one with very little castor in it. I've been using Morgan Cool Power pink, it's 95% syn & 5% castor for 4 years with great results. Unfortunately it's no longer available, when mine is gone I'll switch to Cool Power green full syn. I have a separate tank with hoses & filter I fill, then disconnect the onboard lines & hook this tank up. Radio off, set the throttle to approx. 1/2 & fire it up, leaving the glow igniter on. I use my thumb to choke it dog azz rich & keep the rpm's down to a fast idle. I let it run like this for a couple minutes, pull the fuel line off & let it burn off any remaining fuel. After that I try to crank it a couple more times to remove as much burnable alcohol as possible. After that, piston at BDC, throttle wide open, glow plug out & any remaining methanol will evaporate due to the heat almost instantly; leaving PLENTY of oil to protect your engine. Let it cool & close/seal it up as you would normally do. Blow it out with fuel as usual next time you run. This procedure was shared with me by Chris Wittrig & Jimmy Johnson & has greatly increased the life of my engines (-; Takes no longer than "normal" after run procedures & is neater/cleaner, too. It also is better than spinning a cold engine with the starter against the pinch. Building heat relieves that strain on moving parts, another advantage!