Methanol attracts water, and thus causes metal parts to corrode.
To be sure to run all methanol out of the engine, I used zippo lighter fuel (naphta), mixed with automatic transmission oil (AKA after run) in a 50/50 mix. At the end of the day, clamp off the fuel line, and run a few squirts of this mixture at high idle whilst keeping the plug lit.
This removes most of the methanol and acid combustion by-products from the engine. At the same time, all parts are covered with the highly acid buffered tranny oil to neutralize any combustion products left, and prevent rust.
Engine outside is cleaned with tissue and WD40, which also leaves a corrosion protecting film when dry.