90% isopropyl alcohol for the hull interior, Windex for the outside of the hull. After run is methanol & 30% Byron's oil (95% synthetic/5% castor), I use a separate tank, run the engine dog azz rich (it will run hotter than on 65% fuel) at a fairly high idle. I leave the glow igniter on during the entire after run procedure. I will use my finger over the carb to keep it rich & the rpm down. Run until hot, at least a minute. Disconnect line, let it run out, crank it with the glow plug igniter still on to burn out any methanol, put it in the car - done.