I suppose all this talk of cleaning engines with watery solutions is for some REALLY cruddy engines? It is not a practice I would encourage in the confines of a trawler's engine room. My 32-year old Grand Banks green-painted Lehman 120s may not be pristine, but they have never been (at least in the 18+ years I have cared for them) so filthy that they required Simple Green or Simple Green mixed with water and then doused with a hose. Heavens forbid! Shame on you for letting things in the holy place get so far gone! WD-40 (or an equivalent) applied with elbow grease and a rag are quite enough, thank you. And don't forget to look around under things like heat exchangers and oil coolers where raw water may have gotten loose for rusted bolts on things like engine mounts and water pumps. Hose them with PB Blaster, loosen and retorque, clean up with wire brush and rust converter, and repaint. When paint dries, hit with WD-40 again. If you keep the engine's exterior coated with something like WD40, it will clean up much easier with the same product and a rag when you get your lazy butt down there to caress it. :) Somebody's gonna get a fine boat when I die. :) Rich Gano CALYPSO (GB-42-295) Southport, FL (Panama City area)