Preach away!

I am very new to this, and my son is 10, so we can use all the help we can get.
The engine is in the plane, (yes, a 2s), and I had already read about the teather and after-run oil, so we are all set there. I plan on running a complete tank through as per the instructions, so we should get all the fuel out.
Something I forgot to ask. How about cleanup? What is the best way to clean fuel/exhaust residue off the plane after it is run?
Thanks again for all the info!