engine oil
I have not used after run oil on a routine basis but I am careful to remove all fuel from the engine at the end of each day like Scale buff. However, I use a slightly different method. After my last flight of the day, I suck all of the fuel out of the tank with my fuel pump. I then restrain the airplane, open the throttle to full and start the engine. It typically runs for a few seconds and stops. I continue to start the engine until it will no long fire. Then I pack up and go home.
If I won't be back for a while, I will run some after run oil through the engine by squirting some down the carb barrel and flipping the prop over several times.
If I'm storing the engine for an extended time, I will additionally remove the glow plug and turn the engine over with a starter for a while to really distribute the oil completely and wipe down the externals of the engine with after run oil and put the entire engine in a zip lock bag.