I was living overseas and had an OHC cylinder head re-worked at a small shop once. New (to me) car and I didn't get the timing belt changed fast enough. Anyhow, the character that replaced the two bent valves took the head into his wash bay when he was done, set it on the concrete floor and sprayed it down thoroughly with gasoline. Then he hit it hard with the pressure washer, rolling it over to get both sides. A good blast of compressed air to get the water off and it was clean and done. He just said oil it well before starting the engine... which I did. I had no problems with that head. Go figure.