Will the Dawn work for the nasty grease and oil on the fiberglass in the engine room, too?
I'm thinking I can spray something on the sides and bottom in there, then reach in with a sponge mop or brush and scrub it off, then rinse everything into the bilge and pump it out with my vacuum extractor that I use for oil changes. Does that sound like it will work?
Dawn works great on grease, but I have always tossed some in and let it soak. I don't need to let it soak long. If you can let a mix of water and Dawn sit on the bottom that would work, but I don't know about the sides. I think it would work, but you'll want to keep the sides wet with Dawn while you scrub.